-dnl xlC needs -qunique under AIX so that one source file can be
-dnl compiled to multiple object files and safely linked together.
-if test "x$XLCXX" = "xyes" -a "x$USE_AIX" = "x1"; then
- CXXFLAGS="-qunique $CXXFLAGS"
+if test "x$USE_AIX" = "x1"; then
+ dnl xlC needs -qunique under AIX so that one source file can be
+ dnl compiled to multiple object files and safely linked together.
+ if test "x$XLCXX" = "xyes"; then
+ CXXFLAGS="-qunique $CXXFLAGS"
+ fi
+
+ dnl AIX sys/timer.h header #defines func_data as t_union.data breaking the
+ dnl compilation of GTK+ headers that use func_data as parameter name in
+ dnl several places. We could work around this by inserting "#undef
+ dnl func_data" in the code but IBM provides a possibility to disable this
+ dnl #define by pre-defining the symbol below and this seems to be simpler.
+ dnl And if we have any problems because of it we can always remove it and
+ dnl use the #undef approach.
+ CPPFLAGS="-D_LINUX_SOURCE_COMPAT $CPPFLAGS"