Problem:    MacOS: configure removes -O2 from $CFLAGS.
Solution:   Only adjust $CFLAGS for gcc. (closes #12351)

Problem:    MacOS: building fails if clock_gettime() is not available.
Solution:   Add a configure check for clock_gettime(). (closes #12242)

Problem:    openSUSE: configure doesn't find the Motif library. (Tony
            Mechelynck)
Solution:   Also search in /usr/lib64.

Problem:    MacOS: Python 3 using framework do not set dll name properly.
Solution:   Use the framework prefix. (Yee Cheng Chin, closes #12189)

Problem:    On some systems the Lua library is not found.
Solution:   Check if a subdirectory for Lua exists.  (closes #4475)

Problem:    Handling of FORTIFY_SOURCE flags doesn't match Fedora usage.
Solution:   Adjust the "sed" patterns. (Zdenek Dohnal, closes #11847)

Problem:    Configure does not handle all FORTIFY_SOURCE variants.
Solution:   Also handle Fedora's default FORTIFY_SOURCE flags. (Zdenek Dohnal,
            closes #11794)

Problem:    Build fails on Mac OS X 10.4/10.5 .
Solution:   Check if the dispatch/dispatch.h header exists. (Evan Miller,
            closes #11746)

Problem:    Using Ruby LDFLAGS may cause build problems.
Solution:   Do not add Ruby LDFLAGS to Vim's LDFLAGS. (Zdenek Dohnal,
            closes #11592)

Problem:    Warning for missing return type.
Solution:   Add "int". (San James, closes #11496)