configure.in: Make it possible to force the shipped version of libiptc.

You can force the shipped version of libiptc using:
  --with-libiptc=shipped

Apparently enough systems include broken versions of that library :/

diff --git a/configure.in b/configure.in
index c46049a..2471a2f 100644 (file)
--- a/configure.in
+++ b/configure.in
@@ -1428,14 +1428,18 @@ AM_CONDITIONAL(BUILD_WITH_LIBGCRYPT, test "x$with_libgcrypt" = "xyes")
 with_own_libiptc="no"
 AC_ARG_WITH(libiptc, [AS_HELP_STRING([--with-libiptc@<:@=PREFIX@:>@], [Path to libiptc.])],
 [
-       if test "x$withval" != "xno" && test "x$withval" != "xyes"
+       if test "x$withval" = "xshipped"
+       then
+               with_own_libiptc="yes"
+               with_libiptc="yes"
+       else if test "x$withval" != "xno" && test "x$withval" != "xyes"
        then
                LDFLAGS="$LDFLAGS -L$withval/lib"
                CPPFLAGS="$CPPFLAGS -I$withval/include"
                with_libiptc="yes"
        else
                with_libiptc="$withval"
-       fi
+       fi; fi
 ],
 [
        if test "x$ac_system" = "xLinux"
@@ -1445,7 +1449,7 @@ AC_ARG_WITH(libiptc, [AS_HELP_STRING([--with-libiptc@<:@=PREFIX@:>@], [Path to l
                with_libiptc="no (Linux only)"
        fi
 ])
-if test "x$with_libiptc" = "xyes"
+if test "x$with_libiptc" = "xyes" && test "x$with_own_libiptc" = "xno"
 then
        AC_CHECK_LIB(iptc, iptc_init,
        [
@@ -1456,7 +1460,7 @@ then
                with_own_libiptc="yes"
        ])
 fi
-if test "x$with_libiptc" = "xyes" -a "x$with_own_libiptc" != "xyes"
+if test "x$with_libiptc" = "xyes" && test "x$with_own_libiptc" = "xno"
 then
        AC_CHECK_HEADERS(libiptc/libiptc.h,
        [