+# --with-libgps {{{
+with_libgps_cflags=""
+with_libgps_ldflags=""
+AC_ARG_WITH(libgps, [AS_HELP_STRING([--with-libgps@<:@=PREFIX@:>@], [Path to libgps.])],
+[
+ if test "x$withval" != "xno" && test "x$withval" != "xyes"
+ then
+ with_libgps_cflags="-I$withval/include"
+ with_libgps_ldflags="-L$withval/lib"
+ with_libgps="yes"
+ else
+ with_libgps="$withval"
+ fi
+],
+[
+ with_libgps="yes"
+])
+if test "x$with_libgps" = "xyes"
+then
+ SAVE_CFLAGS="$CFLAGS"
+ CFLAGS="$CFLAGS $with_libgps_cflags"
+
+ AC_CHECK_HEADERS(gps.h, [with_libgps="yes"], [with_libgps="no (gps.h not found)"])
+
+ CFLAGS="$SAVE_CFLAGS"
+fi
+if test "x$with_libgps" = "xyes"
+then
+ SAVE_CFLAGS="$CFLAGS"
+ SAVE_LDFLAGS="$LDFLAGS"
+ CFLAGS="$CFLAGS $with_libgps_cflags"
+ LDFLAGS="$LDFLAGS $with_libgps_ldflags"
+
+ AC_CHECK_LIB(gps, gps_open, [with_libgps="yes"], [with_libgps="no (symbol gps_open not found)"])
+
+ CFLAGS="$SAVE_CFLAGS"
+ LDFLAGS="$SAVE_LDFLAGS"
+fi
+if test "x$with_libgps" = "xyes"
+then
+ BUILD_WITH_LIBGPS_CFLAGS="$with_libgps_cflags"
+ BUILD_WITH_LIBGPS_LDFLAGS="$with_libgps_ldflags"
+ BUILD_WITH_LIBGPS_LIBS="-lgps"
+ AC_SUBST(BUILD_WITH_LIBGPS_CFLAGS)
+ AC_SUBST(BUILD_WITH_LIBGPS_LDFLAGS)
+ AC_SUBST(BUILD_WITH_LIBGPS_LIBS)
+fi
+AM_CONDITIONAL(BUILD_WITH_LIBGPS, test "x$with_libgps" = "xyes")
+# }}}
+