Dear Bereket,

    I guess the linking fails as gcc can not use python.dll directly.

Did you use pexports for building libpython.a?

This web page e.g. gives a good explanation:

Hope that helps.
Sincerely yours


I'm trying to install PyGSL on my computer (64 bit Windows 7), with Python 2.7 and GSL 1.15 installed. I'm pretty much stuck and I would love for some extra help. GSL installed fine, but its the wrapper that's the problem. For some reason I can't build pygsl. Apparently gcc is the problem (got the same problem on another windows machine). Or it could be that pygsl appears to be using a file named AMD64 while my computer is x86. I would love to use the windows binary for pygsl, but it only exists for python 2.5, and my project needs 2.6 or higher. I've used both the windows binary for GSL and built it from source, but I get the same problem either way. I tried copying dlls from GSL into pygsl but that didn't work. Some forums mentioned a file called gsl.dll but I can't seem to find it. I've also tried to use Cygwin and to compile with minGW32 to no avail. 

cmds I ran:
python install
python build
python build_ext -i
python build --compiler=mingw32

Any ideas?? Thanks.


Got the same message in Cygwin as in the windows cmd prompt. Error message:

$ /cygdrive/c/Python27/python.exe build_ext -i
Building testing ufuncs!
running build_ext
building 'errno' extension
C compiler: gcc -g -DDEBUG -DMS_WIN64 -mno-cygwin -O0 -Wall -Wstrict-prototypes

compile options: '-DSWIG_COBJECT_TYPES=1 -DGSL_RANGE_CHECK=1 -DDEBUG=1 -DNUMERIC=0 -DPYGSL_GSL_MAJOR_VERSION=1 -DPYGSL_GSL_MINOR_VERSION=15 -UNDEBUG -IC:\Users\Bereket\gsl-1.15\include -IInclude -I. -IC:\Python27\lib\site-packages\numpy\core\include -IC:\Python27\include -IC:\Python27\PC -c'
gcc -g -DDEBUG -DMS_WIN64 -mno-cygwin -O0 -Wall -Wstrict-prototypes -DSWIG_COBJECT_TYPES=1 -DGSL_RANGE_CHECK=1 -DDEBUG=1 -DNUMERIC=0 -DPYGSL_GSL_MAJOR_VERSION=1 -DPYGSL_GSL_MINOR_VERSION=15 -UNDEBUG -IC:\Users\Bereket\gsl-1.15\include -IInclude -I. -IC:\Python27\lib\site-packages\numpy\core\include -IC:\Python27\include -IC:\Python27\PC -c src/init/errorno.c -o build\\Release\src\init\errorno.o
Found executable C:\cygwin\bin\gcc.exe
gcc -g -mno-cygwin -shared build\\Release\src\init\errorno.o -LC:\Users\Bereket\gsl-1.15\lib -LC:\Python27\libs -LC:\Python27\PCbuild\amd64 -lgsl -lgslcblas -lm -lpython27 -lmsvcr90 -o C:\Python27\Lib\pygsl-0.9.5\pygsl\errno.pyd
build\\Release\src\init\errorno.o: In function `add_errno':
/cygdrive/c/Python27/Lib/pygsl-0.9.5/src/init/errorno.c:14: undefined reference to `__imp__PyInt_FromLong'
/cygdrive/c/Python27/Lib/pygsl-0.9.5/src/init/errorno.c:20: undefined reference to `__imp__PyDict_SetItemString'
build\\Release\src\init\errorno.o: In function `initerrno':
/cygdrive/c/Python27/Lib/pygsl-0.9.5/src/init/errorno.c:37: undefined reference to `__imp__Py_InitModule4_64'
/cygdrive/c/Python27/Lib/pygsl-0.9.5/src/init/errorno.c:40: undefined reference to `__imp__PyModule_GetDict'
collect2: ld returned 1 exit status
error: Command "gcc -g -mno-cygwin -shared build\\Release\src\init\errorno.o -LC:\Users\Bereket\gsl-1.15\lib -LC:\Python27\libs -LC:\Python27\PCbuild\amd64 -lgsl -lgslcblas -lm -lpython27 -lmsvcr90 -o C:\Python27\Lib\pygsl-0.9.5\pygsl\errno.pyd" failed with exit status 1

  Pierre Schnizer  <>
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