Hello,
 
Ensure that your command using --disable-multilib & --disable-decimal-float 
options.
 
So the whole command must be in this form :
../gcc-4.5.1/configure \
--target=$LFS_TGT --prefix=/tools \
--disable-nls --disable-shared --disable-multilib \
--disable-decimal-float --disable-threads \
--disable-libmudflap --disable-libssp \
--disable-libgomp --enable-languages=c \
--with-gmp-include=$(pwd)/gmp --with-gmp-lib=$(pwd)/gmp/.libs \
--without-ppl --without-cloog

Before using this command ,please use ../gcc-4.5.1/make clean , then use this 
command and then make ,make install ,& symlink command in the book.
 
--Fady
 

> Date: Sun, 5 Dec 2010 21:21:21 -0500
> Subject: error: fenv.h: No such file or directory
> From: [email protected]
> To: [email protected]
> 
> Got this error well into the compilation of GCC-4.4.3 Pass 1. I'm using LFS 
> 6.6.
> 
> -----------------------------------
> make[2]: Entering directory `/mnt/lfs/gcc_build/i686-lfs-linux-gnu/libgcc'
> # If this is the top-level multilib, build all the other
> # multilibs.
> /mnt/lfs/gcc_build/./gcc/xgcc -B/mnt/lfs/gcc_build/./gcc/
> -B/tools/i686-lfs-linux-gnu/bin/ -B/tools/i686-lfs-linux-gnu/lib/
> -isystem /tools/i686-lfs-linux-gnu/include -isystem
> /tools/i686-lfs-linux-gnu/sys-include -g -O2 -O2 -g -O2 -DIN_GCC
> -DCROSS_DIRECTORY_STRUCTURE -W -Wall -Wwrite-strings
> -Wstrict-prototypes -Wmissing-prototypes -Wcast-qual
> -Wold-style-definition -isystem ./include -fPIC -g -DIN_LIBGCC2
> -D__GCC_FLOAT_NOT_NEEDED -Dinhibit_libc -I. -I. -I../.././gcc
> -I../../../gcc-4.4.3/libgcc -I../../../gcc-4.4.3/libgcc/.
> -I../../../gcc-4.4.3/libgcc/../gcc
> -I../../../gcc-4.4.3/libgcc/../include
> -I../../../gcc-4.4.3/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT
> -DHAVE_CC_TLS -DUSE_TLS -o bid_decimal_globals.o -MT
> bid_decimal_globals.o -MD -MP -MF bid_decimal_globals.dep -c
> ../../../gcc-4.4.3/libgcc/config/libbid/bid_decimal_globals.c
> ../../../gcc-4.4.3/libgcc/config/libbid/bid_decimal_globals.c:47:18:
> error: fenv.h: No such file or directory
> ---------------------------------------------------
> 
> Googling this error suggests that I should use the
> --disable-decimal-float option, which of course I did as the book says
> to use.
> 
> Any help would be appreciated.
> 
> thanx
> /carl h.
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