Try harder to find GNU Make when configuring.
* configure.ac (AC_PROG_MAKE_SET): Define a dummy. (MAKE): Set it to GNU Make, if one can be found. Search PATH for 'make', 'gmake', 'gnumake'. This works better on platforms like AIX, where GNU Make might be in /opt/freeware/bin/make, and reside behind /usr/bin/make in the PATH.
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