I get this build error when trying to build tachyon-0.98.9.p5 in the recent 
Sage 7.5.1.
Is there a fix for this?
thanks

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Found local metadata for tachyon-0.98.9.p5
Using cached file /tmp/SBo/sage-7.5.1/upstream/tachyon-0.98.9.tar.bz2
tachyon-0.98.9.p5
====================================================
Setting up build directory for tachyon-0.98.9.p5
Finished extraction
Applying patches from ../patches...
Applying ../patches/Make-arch.patch
patching file unix/Make-arch
Applying ../patches/Make-config.patch
patching file unix/Make-config
Applying ../patches/main.c.patch
patching file demosrc/main.c
****************************************************
Host system:
Linux Geremia 4.4.38 #2 SMP Sun Dec 11 16:11:02 CST 2016 x86_64 Intel(R) 
Core(TM) i5-2410M CPU @ 2.30GHz GenuineIntel GNU/Linux
****************************************************
C compiler: gcc
C compiler version:
Reading specs from /usr/lib64/gcc/x86_64-slackware-linux/5.4.0/specs
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-slackware-linux/5.4.0/lto-wrapper
Target: x86_64-slackware-linux
Configured with: ../gcc-5.4.0/configure --prefix=/usr --libdir=/usr/lib64 
--mandir=/usr/man --infodir=/usr/info --enable-shared --enable-bootstrap 
--enable-languages=ada,c,c++,fortran,go,java,lto,objc --enable-threads=posix 
--enable-checking=release --enable-objc-gc --with-system-zlib 
--with-python-dir=/lib64/python2.7/site-packages --enable-libstdcxx-dual-abi 
--with-default-libstdcxx-abi=gcc4-compatible --disable-libunwind-exceptions 
--enable-__cxa_atexit --enable-libssp --enable-lto --disable-install-libiberty 
--with-gnu-ld --verbose --enable-java-home --with-java-home=/usr/lib64/jvm/jre 
--with-jvm-root-dir=/usr/lib64/jvm 
--with-jvm-jar-dir=/usr/lib64/jvm/jvm-exports --with-arch-directory=amd64 
--with-antlr-jar=/home/slackware/slackbuilds/gcc/antlr-runtime-3.4.jar 
--enable-multilib --target=x86_64-slackware-linux 
--build=x86_64-slackware-linux --host=x86_64-slackware-linux
Thread model: posix
gcc version 5.4.0 (GCC) 
****************************************************
make[3]: Entering directory 
'/tmp/SBo/sage-7.5.1/local/var/tmp/sage/build/tachyon-0.98.9.p5/src/unix'
make[3]: warning: -jN forced in submake: disabling jobserver mode.
make all \
"ARCH = linux-64-thr" \
"CFLAGS = -m64 -Wall -O3 -fomit-frame-pointer -ffast-math -DLinux -DLP64 -DTHR 
-D_REENTRANT  -DUSEPNG    -I/tmp/SBo/sage-7.5.1/local/include " \
"ARFLAGS = r" \
"STRIP = strip" \
"LIBS = -L. -ltachyon  -L/tmp/SBo/sage-7.5.1/local/lib -lpng12 -lz 
-L/tmp/SBo/sage-7.5.1/local/lib -Wl,-rpath,/tmp/SBo/sage-7.5.1/local/lib   -lm 
-lpthread"
make: Entering an unknown directory
make: *** empty variable name.  Stop.
make: Leaving an unknown directory
make[3]: *** [Make-arch:1085: linux-64-thr] Error 2
make[3]: Leaving directory 
'/tmp/SBo/sage-7.5.1/local/var/tmp/sage/build/tachyon-0.98.9.p5/src/unix'
Error building Tachyon Ray Tracer.

real    0m0.196s
user    0m0.012s
sys     0m0.005s
************************************************************************
Error installing package tachyon-0.98.9.p5
************************************************************************
Please email sage-devel (http://groups.google.com/group/sage-devel)
explaining the problem and including the relevant part of the log file
  /tmp/SBo/sage-7.5.1/logs/pkgs/tachyon-0.98.9.p5.log
Describe your computer, operating system, etc.
If you want to try to fix the problem yourself, *don't* just cd to
/tmp/SBo/sage-7.5.1/local/var/tmp/sage/build/tachyon-0.98.9.p5 and type 'make' 
or whatever is appropriate.
Instead, the following commands setup all environment variables
correctly and load a subshell for you to debug the error:
  (cd '/tmp/SBo/sage-7.5.1/local/var/tmp/sage/build/tachyon-0.98.9.p5' && 
'/tmp/SBo/sage-7.5.1/sage' --sh)
When you are done debugging, you can type "exit" to leave the subshell.
************************************************************************
Found local metadata for tachyon-0.98.9.p5
Using cached file /tmp/SBo/sage-7.5.1/upstream/tachyon-0.98.9.tar.bz2
tachyon-0.98.9.p5
====================================================
Moving old directory tachyon-0.98.9.p5 to 
/tmp/SBo/sage-7.5.1/local/var/tmp/sage/build/old...
Setting up build directory for tachyon-0.98.9.p5
Finished extraction
Applying patches from ../patches...
Applying ../patches/Make-arch.patch
patching file unix/Make-arch
Applying ../patches/Make-config.patch
patching file unix/Make-config
Applying ../patches/main.c.patch
patching file demosrc/main.c
****************************************************
Host system:
Linux Geremia 4.4.38 #2 SMP Sun Dec 11 16:11:02 CST 2016 x86_64 Intel(R) 
Core(TM) i5-2410M CPU @ 2.30GHz GenuineIntel GNU/Linux
****************************************************
C compiler: gcc
C compiler version:
Reading specs from /usr/lib64/gcc/x86_64-slackware-linux/5.4.0/specs
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-slackware-linux/5.4.0/lto-wrapper
Target: x86_64-slackware-linux
Configured with: ../gcc-5.4.0/configure --prefix=/usr --libdir=/usr/lib64 
--mandir=/usr/man --infodir=/usr/info --enable-shared --enable-bootstrap 
--enable-languages=ada,c,c++,fortran,go,java,lto,objc --enable-threads=posix 
--enable-checking=release --enable-objc-gc --with-system-zlib 
--with-python-dir=/lib64/python2.7/site-packages --enable-libstdcxx-dual-abi 
--with-default-libstdcxx-abi=gcc4-compatible --disable-libunwind-exceptions 
--enable-__cxa_atexit --enable-libssp --enable-lto --disable-install-libiberty 
--with-gnu-ld --verbose --enable-java-home --with-java-home=/usr/lib64/jvm/jre 
--with-jvm-root-dir=/usr/lib64/jvm 
--with-jvm-jar-dir=/usr/lib64/jvm/jvm-exports --with-arch-directory=amd64 
--with-antlr-jar=/home/slackware/slackbuilds/gcc/antlr-runtime-3.4.jar 
--enable-multilib --target=x86_64-slackware-linux 
--build=x86_64-slackware-linux --host=x86_64-slackware-linux
Thread model: posix
gcc version 5.4.0 (GCC) 
****************************************************
make[3]: Entering directory 
'/tmp/SBo/sage-7.5.1/local/var/tmp/sage/build/tachyon-0.98.9.p5/src/unix'
make[3]: warning: -jN forced in submake: disabling jobserver mode.
make all \
"ARCH = linux-64-thr" \
"CFLAGS = -m64 -Wall -O3 -fomit-frame-pointer -ffast-math -DLinux -DLP64 -DTHR 
-D_REENTRANT  -DUSEPNG    -I/tmp/SBo/sage-7.5.1/local/include " \
"ARFLAGS = r" \
"STRIP = strip" \
"LIBS = -L. -ltachyon  -L/tmp/SBo/sage-7.5.1/local/lib -lpng12 -lz 
-L/tmp/SBo/sage-7.5.1/local/lib -Wl,-rpath,/tmp/SBo/sage-7.5.1/local/lib   -lm 
-lpthread"
make: Entering an unknown directory
make: *** empty variable name.  Stop.
make: Leaving an unknown directory
make[3]: *** [Make-arch:1085: linux-64-thr] Error 2
make[3]: Leaving directory 
'/tmp/SBo/sage-7.5.1/local/var/tmp/sage/build/tachyon-0.98.9.p5/src/unix'
Error building Tachyon Ray Tracer.

real    0m0.129s
user    0m0.013s
sys     0m0.004s
************************************************************************
Error installing package tachyon-0.98.9.p5
************************************************************************
Please email sage-devel (http://groups.google.com/group/sage-devel)
explaining the problem and including the relevant part of the log file
  /tmp/SBo/sage-7.5.1/logs/pkgs/tachyon-0.98.9.p5.log
Describe your computer, operating system, etc.
If you want to try to fix the problem yourself, *don't* just cd to
/tmp/SBo/sage-7.5.1/local/var/tmp/sage/build/tachyon-0.98.9.p5 and type 'make' 
or whatever is appropriate.
Instead, the following commands setup all environment variables
correctly and load a subshell for you to debug the error:
  (cd '/tmp/SBo/sage-7.5.1/local/var/tmp/sage/build/tachyon-0.98.9.p5' && 
'/tmp/SBo/sage-7.5.1/sage' --sh)
When you are done debugging, you can type "exit" to leave the subshell.
************************************************************************
Found local metadata for tachyon-0.98.9.p5
Using cached file /tmp/SBo/sage-7.5.1/upstream/tachyon-0.98.9.tar.bz2
tachyon-0.98.9.p5
====================================================
Setting up build directory for tachyon-0.98.9.p5
Finished extraction
Applying patches from ../patches...
Applying ../patches/Make-arch.patch
patching file unix/Make-arch
Applying ../patches/Make-config.patch
patching file unix/Make-config
Applying ../patches/main.c.patch
patching file demosrc/main.c
****************************************************
Host system:
Linux Geremia 4.4.38 #2 SMP Sun Dec 11 16:11:02 CST 2016 x86_64 Intel(R) 
Core(TM) i5-2410M CPU @ 2.30GHz GenuineIntel GNU/Linux
****************************************************
C compiler: gcc
C compiler version:
Reading specs from /usr/lib64/gcc/x86_64-slackware-linux/5.4.0/specs
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-slackware-linux/5.4.0/lto-wrapper
Target: x86_64-slackware-linux
Configured with: ../gcc-5.4.0/configure --prefix=/usr --libdir=/usr/lib64 
--mandir=/usr/man --infodir=/usr/info --enable-shared --enable-bootstrap 
--enable-languages=ada,c,c++,fortran,go,java,lto,objc --enable-threads=posix 
--enable-checking=release --enable-objc-gc --with-system-zlib 
--with-python-dir=/lib64/python2.7/site-packages --enable-libstdcxx-dual-abi 
--with-default-libstdcxx-abi=gcc4-compatible --disable-libunwind-exceptions 
--enable-__cxa_atexit --enable-libssp --enable-lto --disable-install-libiberty 
--with-gnu-ld --verbose --enable-java-home --with-java-home=/usr/lib64/jvm/jre 
--with-jvm-root-dir=/usr/lib64/jvm 
--with-jvm-jar-dir=/usr/lib64/jvm/jvm-exports --with-arch-directory=amd64 
--with-antlr-jar=/home/slackware/slackbuilds/gcc/antlr-runtime-3.4.jar 
--enable-multilib --target=x86_64-slackware-linux 
--build=x86_64-slackware-linux --host=x86_64-slackware-linux
Thread model: posix
gcc version 5.4.0 (GCC) 
****************************************************
make[2]: Entering directory 
'/tmp/SBo/sage-7.5.1/local/var/tmp/sage/build/tachyon-0.98.9.p5/src/unix'
make[2]: warning: -jN forced in submake: disabling jobserver mode.
make all \
"ARCH = linux-64-thr" \
"CFLAGS = -m64 -Wall -O3 -fomit-frame-pointer -ffast-math -DLinux -DLP64 -DTHR 
-D_REENTRANT  -DUSEPNG    -I/tmp/SBo/sage-7.5.1/local/include " \
"ARFLAGS = r" \
"STRIP = strip" \
"LIBS = -L. -ltachyon  -L/tmp/SBo/sage-7.5.1/local/lib -lpng12 -lz 
-L/tmp/SBo/sage-7.5.1/local/lib -Wl,-rpath,/tmp/SBo/sage-7.5.1/local/lib   -lm 
-lpthread"
make: Entering an unknown directory
make: *** empty variable name.  Stop.
make: Leaving an unknown directory
make[2]: *** [Make-arch:1085: linux-64-thr] Error 2
make[2]: Leaving directory 
'/tmp/SBo/sage-7.5.1/local/var/tmp/sage/build/tachyon-0.98.9.p5/src/unix'
Error building Tachyon Ray Tracer.

real    0m0.014s
user    0m0.008s
sys     0m0.004s
************************************************************************
Error installing package tachyon-0.98.9.p5
************************************************************************
Please email sage-devel (http://groups.google.com/group/sage-devel)
explaining the problem and including the relevant part of the log file
  /tmp/SBo/sage-7.5.1/logs/pkgs/tachyon-0.98.9.p5.log
Describe your computer, operating system, etc.
If you want to try to fix the problem yourself, *don't* just cd to
/tmp/SBo/sage-7.5.1/local/var/tmp/sage/build/tachyon-0.98.9.p5 and type 'make' 
or whatever is appropriate.
Instead, the following commands setup all environment variables
correctly and load a subshell for you to debug the error:
  (cd '/tmp/SBo/sage-7.5.1/local/var/tmp/sage/build/tachyon-0.98.9.p5' && 
'/tmp/SBo/sage-7.5.1/sage' --sh)
When you are done debugging, you can type "exit" to leave the subshell.
************************************************************************
Found local metadata for tachyon-0.98.9.p5
Using cached file /tmp/SBo/sage-7.5.1/upstream/tachyon-0.98.9.tar.bz2
tachyon-0.98.9.p5
====================================================
Setting up build directory for tachyon-0.98.9.p5
Finished extraction
Applying patches from ../patches...
Applying ../patches/Make-arch.patch
patching file unix/Make-arch
Applying ../patches/Make-config.patch
patching file unix/Make-config
Applying ../patches/main.c.patch
patching file demosrc/main.c
****************************************************
Host system:
Linux Geremia 4.4.38 #2 SMP Sun Dec 11 16:11:02 CST 2016 x86_64 Intel(R) 
Core(TM) i5-2410M CPU @ 2.30GHz GenuineIntel GNU/Linux
****************************************************
C compiler: gcc
C compiler version:
Reading specs from /usr/lib64/gcc/x86_64-slackware-linux/5.4.0/specs
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-slackware-linux/5.4.0/lto-wrapper
Target: x86_64-slackware-linux
Configured with: ../gcc-5.4.0/configure --prefix=/usr --libdir=/usr/lib64 
--mandir=/usr/man --infodir=/usr/info --enable-shared --enable-bootstrap 
--enable-languages=ada,c,c++,fortran,go,java,lto,objc --enable-threads=posix 
--enable-checking=release --enable-objc-gc --with-system-zlib 
--with-python-dir=/lib64/python2.7/site-packages --enable-libstdcxx-dual-abi 
--with-default-libstdcxx-abi=gcc4-compatible --disable-libunwind-exceptions 
--enable-__cxa_atexit --enable-libssp --enable-lto --disable-install-libiberty 
--with-gnu-ld --verbose --enable-java-home --with-java-home=/usr/lib64/jvm/jre 
--with-jvm-root-dir=/usr/lib64/jvm 
--with-jvm-jar-dir=/usr/lib64/jvm/jvm-exports --with-arch-directory=amd64 
--with-antlr-jar=/home/slackware/slackbuilds/gcc/antlr-runtime-3.4.jar 
--enable-multilib --target=x86_64-slackware-linux 
--build=x86_64-slackware-linux --host=x86_64-slackware-linux
Thread model: posix
gcc version 5.4.0 (GCC) 
****************************************************
make[2]: Entering directory 
'/tmp/SBo/sage-7.5.1/local/var/tmp/sage/build/tachyon-0.98.9.p5/src/unix'
make[2]: warning: -jN forced in submake: disabling jobserver mode.
make all \
"ARCH = linux-64-thr" \
"CFLAGS = -m64 -Wall -O3 -fomit-frame-pointer -ffast-math -DLinux -DLP64 -DTHR 
-D_REENTRANT  -DUSEPNG    -I/tmp/SBo/sage-7.5.1/local/include " \
"ARFLAGS = r" \
"STRIP = strip" \
"LIBS = -L. -ltachyon  -L/tmp/SBo/sage-7.5.1/local/lib -lpng12 -lz 
-L/tmp/SBo/sage-7.5.1/local/lib -Wl,-rpath,/tmp/SBo/sage-7.5.1/local/lib   -lm 
-lpthread"
make: Entering an unknown directory
make: *** empty variable name.  Stop.
make: Leaving an unknown directory
make[2]: *** [Make-arch:1085: linux-64-thr] Error 2
make[2]: Leaving directory 
'/tmp/SBo/sage-7.5.1/local/var/tmp/sage/build/tachyon-0.98.9.p5/src/unix'
Error building Tachyon Ray Tracer.

real    0m0.013s
user    0m0.007s
sys     0m0.003s
************************************************************************
Error installing package tachyon-0.98.9.p5
************************************************************************
Please email sage-devel (http://groups.google.com/group/sage-devel)
explaining the problem and including the relevant part of the log file
  /tmp/SBo/sage-7.5.1/logs/pkgs/tachyon-0.98.9.p5.log
Describe your computer, operating system, etc.
If you want to try to fix the problem yourself, *don't* just cd to
/tmp/SBo/sage-7.5.1/local/var/tmp/sage/build/tachyon-0.98.9.p5 and type 'make' 
or whatever is appropriate.
Instead, the following commands setup all environment variables
correctly and load a subshell for you to debug the error:
  (cd '/tmp/SBo/sage-7.5.1/local/var/tmp/sage/build/tachyon-0.98.9.p5' && 
'/tmp/SBo/sage-7.5.1/sage' --sh)
When you are done debugging, you can type "exit" to leave the subshell.
************************************************************************
Found local metadata for tachyon-0.98.9.p5
Using cached file /tmp/SBo/sage-7.5.1/upstream/tachyon-0.98.9.tar.bz2
tachyon-0.98.9.p5
====================================================
Moving old directory tachyon-0.98.9.p5 to 
/tmp/SBo/sage-7.5.1/local/var/tmp/sage/build/old...
Setting up build directory for tachyon-0.98.9.p5
Finished extraction
Applying patches from ../patches...
Applying ../patches/Make-arch.patch
patching file unix/Make-arch
Applying ../patches/Make-config.patch
patching file unix/Make-config
Applying ../patches/main.c.patch
patching file demosrc/main.c
****************************************************
Host system:
Linux Geremia 4.4.38 #2 SMP Sun Dec 11 16:11:02 CST 2016 x86_64 Intel(R) 
Core(TM) i5-2410M CPU @ 2.30GHz GenuineIntel GNU/Linux
****************************************************
C compiler: gcc
C compiler version:
Reading specs from /usr/lib64/gcc/x86_64-slackware-linux/5.4.0/specs
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-slackware-linux/5.4.0/lto-wrapper
Target: x86_64-slackware-linux
Configured with: ../gcc-5.4.0/configure --prefix=/usr --libdir=/usr/lib64 
--mandir=/usr/man --infodir=/usr/info --enable-shared --enable-bootstrap 
--enable-languages=ada,c,c++,fortran,go,java,lto,objc --enable-threads=posix 
--enable-checking=release --enable-objc-gc --with-system-zlib 
--with-python-dir=/lib64/python2.7/site-packages --enable-libstdcxx-dual-abi 
--with-default-libstdcxx-abi=gcc4-compatible --disable-libunwind-exceptions 
--enable-__cxa_atexit --enable-libssp --enable-lto --disable-install-libiberty 
--with-gnu-ld --verbose --enable-java-home --with-java-home=/usr/lib64/jvm/jre 
--with-jvm-root-dir=/usr/lib64/jvm 
--with-jvm-jar-dir=/usr/lib64/jvm/jvm-exports --with-arch-directory=amd64 
--with-antlr-jar=/home/slackware/slackbuilds/gcc/antlr-runtime-3.4.jar 
--enable-multilib --target=x86_64-slackware-linux 
--build=x86_64-slackware-linux --host=x86_64-slackware-linux
Thread model: posix
gcc version 5.4.0 (GCC) 
****************************************************
make[2]: Entering directory 
'/tmp/SBo/sage-7.5.1/local/var/tmp/sage/build/tachyon-0.98.9.p5/src/unix'
make[2]: warning: -jN forced in submake: disabling jobserver mode.
make all \
"ARCH = linux-64-thr" \
"CFLAGS = -m64 -Wall -O3 -fomit-frame-pointer -ffast-math -DLinux -DLP64 -DTHR 
-D_REENTRANT  -DUSEPNG    -I/tmp/SBo/sage-7.5.1/local/include " \
"ARFLAGS = r" \
"STRIP = strip" \
"LIBS = -L. -ltachyon  -L/tmp/SBo/sage-7.5.1/local/lib -lpng12 -lz 
-L/tmp/SBo/sage-7.5.1/local/lib -Wl,-rpath,/tmp/SBo/sage-7.5.1/local/lib   -lm 
-lpthread"
make: Entering an unknown directory
make: *** empty variable name.  Stop.
make: Leaving an unknown directory
make[2]: *** [Make-arch:1085: linux-64-thr] Error 2
make[2]: Leaving directory 
'/tmp/SBo/sage-7.5.1/local/var/tmp/sage/build/tachyon-0.98.9.p5/src/unix'
Error building Tachyon Ray Tracer.

real    0m0.013s
user    0m0.005s
sys     0m0.005s
************************************************************************
Error installing package tachyon-0.98.9.p5
************************************************************************
Please email sage-devel (http://groups.google.com/group/sage-devel)
explaining the problem and including the relevant part of the log file
  /tmp/SBo/sage-7.5.1/logs/pkgs/tachyon-0.98.9.p5.log
Describe your computer, operating system, etc.
If you want to try to fix the problem yourself, *don't* just cd to
/tmp/SBo/sage-7.5.1/local/var/tmp/sage/build/tachyon-0.98.9.p5 and type 'make' 
or whatever is appropriate.
Instead, the following commands setup all environment variables
correctly and load a subshell for you to debug the error:
  (cd '/tmp/SBo/sage-7.5.1/local/var/tmp/sage/build/tachyon-0.98.9.p5' && 
'/tmp/SBo/sage-7.5.1/sage' --sh)
When you are done debugging, you can type "exit" to leave the subshell.
************************************************************************

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