Hi, on 64 Bit I get with 0.5.0.2000: ====================================================================== FAIL: check_x_stride_transpose (scipy.linalg.tests.test_fblas.test_cgemv) ---------------------------------------------------------------------- Traceback (most recent call last): File "/home/abaecker/BUILDS3/BuildDir/inst_numpy/lib/python2.4/site-packages/scipy/linalg/tests/test_fblas.py", line 348, in check_x_stride_transpose assert_array_almost_equal(desired_y,y) File "/home/abaecker/BUILDS3/BuildDir/inst_numpy/lib/python2.4/site-packages/numpy/testing/utils.py", line 222, in assert_array_almost_equal header='Arrays are not almost equal') File "/home/abaecker/BUILDS3/BuildDir/inst_numpy/lib/python2.4/site-packages/numpy/testing/utils.py", line 207, in assert_array_compare assert cond, msg AssertionError: Arrays are not almost equal (mismatch 33.3333333333%) x: array([ 12.88130569-12.88130569j, -13.69222832+15.69222832j, -12.8252039 +16.82520294j], dtyp y: array([ 12.88130569-12.88130569j, -13.69222832+15.69222832j, -12.8252039 +16.82520485j], dtyp The only warnings related to cgemv during the build were: gcc: Lib/linsolve/SuperLU/SRC/cpanel_bmod.c Lib/linsolve/SuperLU/SRC/cpanel_bmod.c:31: warning: function declaration isn't a prototype Lib/linsolve/SuperLU/SRC/cpanel_bmod.c: In function `cpanel_bmod': Lib/linsolve/SuperLU/SRC/cpanel_bmod.c:229: warning: implicit declaration of function `ctrsv_' Lib/linsolve/SuperLU/SRC/cpanel_bmod.c:276: warning: implicit declaration of function `cgemv_' gcc: Lib/linsolve/SuperLU/SRC/csnode_bmod.c The only pointer warnings during the build were: compile options: '-DATLAS_INFO="\"3.7.11\"" -I/scr/python/include -Ibuild/src.linux-x86_64-2.4 -I/home/abaecker/BUILDS3/BuildDir/inst_numpy/lib/python2.4/site-packages/numpy/core/include -I/scr/python/include/python2.4 -c' gcc: build/src.linux-x86_64-2.4/build/src.linux-x86_64-2.4/scipy/linalg/flapackmodule.c build/src.linux-x86_64-2.4/build/src.linux-x86_64-2.4/scipy/linalg/flapackmodule.c: In function `f2py_rout_flapack_cheev': build/src.linux-x86_64-2.4/build/src.linux-x86_64-2.4/scipy/linalg/flapackmodule.c:9761: warning: passing arg 6 of pointer to function from incompatible pointer type build/src.linux-x86_64-2.4/build/src.linux-x86_64-2.4/scipy/linalg/flapackmodule.c: In function `f2py_rout_flapack_zheev': build/src.linux-x86_64-2.4/build/src.linux-x86_64-2.4/scipy/linalg/flapackmodule.c:9945: warning: passing arg 6 of pointer to function from incompatible pointer type /scr/python/bin/g77 -shared build/temp.linux-x86_64-2.4/build/src.linux-x86_64-2.4/build/src.linux-x86_64-2.4/scipy/linalg/flapackmodule.o build/temp.linux-x86_64-2.4/build/src.linux-x86_64-2.4/fortranobject.o -L/scr/python/lib64 -Lbuild/temp.linux-x86_64-2.4 -llapack -lptf77blas -lptcblas -latlas -lg2c -o build/lib.linux-x86_64-2.4/scipy/linalg/flapack.so building 'scipy.linalg.clapack' extension compiling C sources C compiler: gcc -pthread -fno-strict-aliasing -DNDEBUG -g -O3 -Wall -fPIC Best, Arnd