Fedora FC5 linux, with BLAS, LAPACK, ATLAS, FFTW compile options: '-Ibuild/src.linux-x86_64-2.4/numpy/core/src -Inumpy/core/include -Ibuild/src.linux-x86_64-2.4/numpy/core -Inumpy/core/src -Inumpy/core/include -I/usr/include/python2.4 -c' gcc: numpy/core/src/multiarraymodule.c numpy/core/src/multiarraymodule.c: In function ‘initmultiarray’: numpy/core/src/multiarraymodule.c:6860: error: ‘NPY_ALLOW_THREADS’ undeclared (first use in this function) numpy/core/src/multiarraymodule.c:6860: error: (Each undeclared identifier is reported only once numpy/core/src/multiarraymodule.c:6860: error: for each function it appears in.) numpy/core/src/multiarraymodule.c: In function ‘initmultiarray’: numpy/core/src/multiarraymodule.c:6860: error: ‘NPY_ALLOW_THREADS’ undeclared (first use in this function) numpy/core/src/multiarraymodule.c:6860: error: (Each undeclared identifier is reported only once numpy/core/src/multiarraymodule.c:6860: error: for each function it appears in.) error: Command "gcc -pthread -fno-strict-aliasing -DNDEBUG -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -D_GNU_SOURCE -fPIC -fPIC -Ibuild/src.linux-x86_64-2.4/numpy/core/src -Inumpy/core/include -Ibuild/src.linux-x86_64-2.4/numpy/core -Inumpy/core/src -Inumpy/core/include -I/usr/include/python2.4 -c numpy/core/src/multiarraymodule.c -o build/temp.linux-x86_64-2.4/numpy/core/src/multiarraymodule.o" failed with exit status 1