I did an autoscan on the GTK2 directory, and came up with this:

configure.in: warning: missing AC_CHECK_TYPES([ptrdiff_t]) wanted by: pgtk.h:80 configure.in: warning: missing AC_C_CONST wanted by: pgtk.h:107 configure.in: warning: missing AC_PREREQ wanted by: autoscan configure.in: warning: missing AC_PROG_LN_S wanted by: Makefile.in:50

It created a configure.scan, which had the following options added:

AC_PREREQ(2.59)

AC_PROG_CC AC_PROG_LN_S

AC_C_CONST AC_C_INLINE AC_CHECK_TYPES([ptrdiff_t])

Are any of these necessary, or should we put some of them in the configure.in and modify pgtk.h and Makefile.in accordingly?