R Under development (unstable) (2025-05-23 r88232 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> library(pkgbuild)
> 
> check_build_tools(debug = TRUE)
Trying to compile a simple C file
Running "D:/RCompile/recent/R/bin/x64/Rcmd.exe" SHLIB foo.c
using C compiler: 'gcc.exe (GCC) 14.2.0'

make[1]: Entering directory '/d/temp/2025_05_26_12_50_17_188/RtmpMfL5Pq'
gcc  -I"D:/RCompile/recent/R/include" -DNDEBUG     -I"d:/rtools45/x86_64-w64-mingw32.static.posix/include"      -pedantic -Wstrict-prototypes -O2 -Wall -std=gnu2x  -mfpmath=sse -msse2 -mstackrealign   -c foo.c -o foo.o
gcc -shared -s -static-libgcc -o foo.dll tmp.def foo.o -Ld:/rtools45/x86_64-w64-mingw32.static.posix/lib/x64 -Ld:/rtools45/x86_64-w64-mingw32.static.posix/lib -LD:/RCompile/recent/R/bin/x64 -lR
make[1]: Leaving directory '/d/temp/2025_05_26_12_50_17_188/RtmpMfL5Pq'
make[1]: Entering directory '/d/temp/2025_05_26_12_50_17_188/RtmpMfL5Pq'
make[1]: Leaving directory '/d/temp/2025_05_26_12_50_17_188/RtmpMfL5Pq'

Your system is ready to build packages!
> 
> proc.time()
   user  system elapsed 
   0.28    0.12    2.42