This solution did not work.
> Sys.setenv(PKG_LIBS = "/usr/local/lib/libomp.dylib")
> Sys.getenv("PKG_LIBS")
[1] "/usr/local/lib/libomp.dylib"
> install.packages("data.table", type = "source")
trying URL 'https://cran.r-project.org/src/contrib/data.table_1.18.0.tar.gz'
Content type 'application/x-gzip' length 6020932 bytes (5.7 MB)
==================================================
downloaded 5.7 MB
* installing *source* package ‘data.table’ ...
** this is package ‘data.table’ version ‘1.18.0’
** package ‘data.table’ successfully unpacked and MD5 sums checked
** using staged installation
zlib 1.3.1 is available ok
* checking if R installation supports OpenMP with "-Xclang -fopenmp" ... yes
** libs
using C compiler: ‘Apple clang version 17.0.0 (clang-1700.6.3.2)’
using SDK: ‘MacOSX26.2.sdk’
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c assign.c -o assign.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c between.c -o between.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c bmerge.c -o bmerge.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c chmatch.c -o chmatch.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c cj.c -o cj.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c coalesce.c -o coalesce.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c dogroups.c -o dogroups.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c fastmean.c -o fastmean.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c fcast.c -o fcast.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c fifelse.c -o fifelse.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c fmelt.c -o fmelt.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c forder.c -o forder.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c frank.c -o frank.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c fread.c -o fread.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c freadR.c -o freadR.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c froll.c -o froll.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c frollR.c -o frollR.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c frolladaptive.c -o frolladaptive.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c frollapply.c -o frollapply.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c fsort.c -o fsort.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c fwrite.c -o fwrite.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c fwriteR.c -o fwriteR.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c gsumm.c -o gsumm.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c hash.c -o hash.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c idatetime.c -o idatetime.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c ijoin.c -o ijoin.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c init.c -o init.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c inrange.c -o inrange.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c mergelist.c -o mergelist.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c nafill.c -o nafill.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c negate.c -o negate.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c nqrecreateindices.c -o
nqrecreateindices.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c openmp-utils.c -o openmp-utils.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c programming.c -o programming.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c quickselect.c -o quickselect.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c rbindlist.c -o rbindlist.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c reorder.c -o reorder.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c shellsort.c -o shellsort.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c shift.c -o shift.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c snprintf.c -o snprintf.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c subset.c -o subset.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c transpose.c -o transpose.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c types.c -o types.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c uniqlist.c -o uniqlist.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c utils.c -o utils.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c vecseq.c -o vecseq.o
clang -arch x86_64 -I"/Library/Frameworks/R.framework/Resources/include"
-DNDEBUG -I/opt/R/x86_64/include -Xclang -fopenmp -I/opt/local/include
-fPIC -falign-functions=64 -Wall -g -O2 -c wrappers.c -o wrappers.o
clang -arch x86_64 -dynamiclib -Wl,-headerpad_max_install_names -undefined
dynamic_lookup -L/Library/Frameworks/R.framework/Resources/lib
-L/opt/R/x86_64/lib -o data.table.so assign.o between.o bmerge.o chmatch.o cj.o
coalesce.o dogroups.o fastmean.o fcast.o fifelse.o fmelt.o forder.o frank.o
fread.o freadR.o froll.o frollR.o frolladaptive.o frollapply.o fsort.o fwrite.o
fwriteR.o gsumm.o hash.o idatetime.o ijoin.o init.o inrange.o mergelist.o
nafill.o negate.o nqrecreateindices.o openmp-utils.o programming.o
quickselect.o rbindlist.o reorder.o shellsort.o shift.o snprintf.o subset.o
transpose.o types.o uniqlist.o utils.o vecseq.o wrappers.o
/usr/local/lib/libomp.dylib -lomp -L/opt/local/lib -lz
-F/Library/Frameworks/R.framework/.. -framework R
PKG_CFLAGS = -Xclang -fopenmp -I/opt/local/include
PKG_LIBS = /usr/local/lib/libomp.dylib -lomp -L/opt/local/lib -lz
if [ "data.table.so" != "data_table.so" ]; then mv data.table.so data_table.so;
fi
if [ "" != "Windows_NT" ] && [ `uname -s` = 'Darwin' ]; then install_name_tool
-id data_table.so data_table.so; fi
installing to
/Library/Frameworks/R.framework/Versions/4.5-x86_64/Resources/library/00LOCK-data.table/00new/data.table/libs
** R
** inst
** byte-compile and prepare package for lazy loading
** help
*** installing help indices
** building package indices
** installing vignettes
** testing if installed package can be loaded from temporary location
Error: package or namespace load failed for ‘data.table’ in dyn.load(file,
DLLpath = DLLpath, ...):
unable to load shared object
'/Library/Frameworks/R.framework/Versions/4.5-x86_64/Resources/library/00LOCK-data.table/00new/data.table/libs/data_table.so':
dlopen(/Library/Frameworks/R.framework/Versions/4.5-x86_64/Resources/library/00LOCK-data.table/00new/data.table/libs/data_table.so,
0x0006): symbol not found in flat namespace '___kmpc_dispatch_deinit'
Error: loading failed
Execution halted
ERROR: loading failed
* removing
‘/Library/Frameworks/R.framework/Versions/4.5-x86_64/Resources/library/data.table’
The downloaded source packages are in
‘/private/var/folders/d5/sbs6108j6qd9jw7g652bm9sr0000gn/T/RtmpJusqur/downloaded_packages’
Warning message:
In install.packages("data.table", type = "source") :
installation of package ‘data.table’ had non-zero exit status
>
> On Dec 29, 2025, at 1:44 PM, Ivan Krylov <[email protected]> wrote:
>
> В Mon, 29 Dec 2025 17:01:36 +0000
> Naresh Gurbuxani <[email protected]> пишет:
>
>> I removed data.table, then reinstalled using
>> install.packages("data.table", type = "source"). Now data.table
>> install has non-zero exit status.
>>
>> Following instructions at https://mac.r-project.org/openmp/, I
>> installed Open MP support by running on command line
>>
>> curl -O
>> https://mac.r-project.org/openmp/openmp-17.0.6-darwin20-Release.tar.gz
>> sudo tar fvxz openmp-17.0.6-darwin20-Release.tar.gz -C /
>
> Thank you very much for the detailed description of the problem.
>
> For now, since you've installed the OpenMP runtime compatible with the
> new Xcode version you're running, you can tell data.table to use it by
> setting
>
> Sys.setenv(PKG_LIBS = '/usr/local/lib/libomp.dylib')
> install.packages('data.table', type = 'source')
>
> ...but be very careful not to use this build of data.table together in
> the same session with other packages that use OpenMP. (You can
> reinstall them from source in a similar manner to ensure that they are
> compatible. Fortunately(?), almost no R packages on CRAN use OpenMP on
> MacOS.)
>
> Meanwhile, we'll need to figure out why the configure test fails when
> CRAN builders compile data.table for macOS.
>
> --
> Best regards,
> Ivan
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