On systems like Solaris where the ncurses include directory is in an alternate
location, the LIBNCURSES_CFLAGS mechanism fails to substitute the modified
CPPFLAGS in the generated Makefile.
This used to work on tmux 2.2:
% LIBNCURSES_CFLAGS=-I/usr/include/ncurses \
LIBNCURSES_LIBS="-L/usr/lib/64 -lncurses" \
./configure
You can see in configure.ac where $CPPFLAGS is modified when LIBNCURSES_CFLAGS
is present:
if test "x$found_ncurses" = xyes; then
CPPFLAGS="$LIBNCURSES_CFLAGS $LIBTINFO_CFLAGS $CPPFLAGS"
but it is subsequently clobbered without being used:
# Save our CFLAGS/CPPFLAGS/LDFLAGS for the Makefile and restore the old user
# variables.
AC_SUBST(AM_CPPFLAGS)
CPPFLAGS="$SAVED_CPPFLAGS"
diff --git a/configure.ac b/configure.ac
index dcf62ab..2bc61ce 100644
--- a/configure.ac
+++ b/configure.ac
@@ -628,7 +628,7 @@ AM_CONDITIONAL(IS_UNKNOWN, test "x$PLATFORM" = xunknown)
# Save our CFLAGS/CPPFLAGS/LDFLAGS for the Makefile and restore the old user
# variables.
-AC_SUBST(AM_CPPFLAGS)
+AC_SUBST(AM_CPPFLAGS, [$CPPFLAGS])
CPPFLAGS="$SAVED_CPPFLAGS"
AC_SUBST(AM_CFLAGS)
CFLAGS="$SAVED_CFLAGS"
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