mesa-users] Installation Problem: "Function 'isnan' at (1) has no IMPLICIT type"

Aaron Dotter aaron.dotter at
Thu Dec 10 10:50:02 EST 2009

Hi Enrico,

You need to edit the file utils/makefile_header:

# step 2) specify whether isnan is supported or not

# pick one of the following options:

UTILS_ISNAN = utils_isnan_okay
#UTILS_ISNAN = utils_isnan_nope

# If you aren't sure, try setting UTILS_ISNAN = utils_isnan_okay
# If this works, great.  Otherwise, the compilation of the
# mesa/utils module will complain when it tries to invoke isnan.
# In case that happens, you can simply change this makefile_header
# to the UTILS_ISNAN = utils_isnan_nope setting and redo the
# ./install command for mesa.

By default, the relevant section looks like the above.  Change the
UTILS_ISNAN line by commenting out the first and uncommenting the second,
like this:

#UTILS_ISNAN = utils_isnan_okay
UTILS_ISNAN = utils_isnan_nope

This should solve your problem; please let us know if it does not.

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