Naresh,
as for the original problem, just re-install the package binary from CRAN (see
[1], i.e., just run
install.packages("data.table",repos="https://mac.r-project.org";)).
As for your secondary problem (which should be irrelevant by now since you can
get the right binary from CRAN), you have mismatching Xcode and OpenMP
versions. I suspect you are using Xocde/CLT > 16.2 which is incompatible with
the clang 17 run-time (see the note on the OpenMP page). So if you really want
to compile it from sources, the two options you have are a) install Xcode/CLT
16.2 (which uses clang 17) or b) use OpenMP from clang 19. For the latter,
however, you may need some work since that run-time is incompatible with the
libomp shipped with R so you may need to modify the flags (see the note in the
flags section of the OpenMP page), but I'm not 100% sure if data.table supports
that (or you can replace the R run-time with the clang 19 run-time if you don't
use any packages that link to it). Again, it's much easier to install the
updated CRAN binary.
Cheers,
Simon
[1] - https://stat.ethz.ch/pipermail/r-sig-mac/2026-January/015314.html
> On 30/12/2025, at 11:55, Naresh Gurbuxani <[email protected]>
> wrote:
>
> I should have posted this here.
>
> Sent from my iPhone
>
> Begin forwarded message:
>
> From: Naresh Gurbuxani <[email protected]>
> Date: December 29, 2025 at 12:02:10 PM EST
> To: [email protected]
> Subject: [R] data.table does not find openmp support
>
>
> On my Intel Mac, with R 4.4, data.table worked with openmp support.
> After installing R 4.5, I reinstalled data.table using
> install.packages("data.table"). Installation went smoothly, but
> data.table did not detect openmp support. 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 /
>
> Below is information from my R session:
>
> sessionInfo()
> R version 4.5.2 (2025-10-31)
> Platform: x86_64-apple-darwin20
> Running under: macOS Sequoia 15.7.3
>
> Matrix products: default
> BLAS:
> /Library/Frameworks/R.framework/Versions/4.5-x86_64/Resources/lib/libRblas.0.dylib
> LAPACK:
> /Library/Frameworks/R.framework/Versions/4.5-x86_64/Resources/lib/libRlapack.dylib;
> LAPACK version 3.12.1
>
> locale:
> [1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
>
> time zone: America/New_York
> tzcode source: internal
>
> attached base packages:
> [1] stats graphics utils datasets grDevices methods base
>
> other attached packages:
> [1] lattice_0.22-7
>
> loaded via a namespace (and not attached):
> [1] compiler_4.5.2 tools_4.5.2 grid_4.5.2
> system("gfortran --version")
> GNU Fortran (GCC) 14.2.0
> Copyright (C) 2024 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions. There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> system("xcode-select -version")
> xcode-select version 2410.
> system("gcc --version")
> Apple clang version 17.0.0 (clang-1700.6.3.2)
> Target: x86_64-apple-darwin24.6.0
> Thread model: posix
> InstalledDir: /Library/Developer/CommandLineTools/usr/bin
> install.packages("data.table", lib = .libPaths()[2], 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 -lomp -L/opt/local/lib -lz -F/Library/Frameworks/R.framework/..
> -framework R
> PKG_CFLAGS = -Xclang -fopenmp -I/opt/local/include
> PKG_LIBS = -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/RtmpqcFVH3/downloaded_packages’
> Warning message:
> In install.packages("data.table", lib = .libPaths()[2], type = "source") :
> installation of package ‘data.table’ had non-zero exit status
> ______________________________________________
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