Can you try the following patch?

--- Makefile    24 Mar 2005 15:00:40 -0000      1.20
+++ Makefile    29 Mar 2005 19:52:02 -0000
@@ -19,10 +19,17 @@
  USE_GNU_TOOLS= make
  USE_LIBTOOL=   YES

+.include "../../mk/bsd.prefs.mk"
+
+# Workaround for pkg/29825 -- older compilers apparently
+# have problems building this package.
+.if (${MACHINE_PLATFORM:MNetBSD-2.0*-*} != "")
+BUILDLINK_TRANSFORM+=  rename:-O2:-O1
+.endif
+
  CONFIGURE_ARGS+=       --enable-nls
  CONFIGURE_ARGS+=       --enable-xinerama

-.include "../../mk/bsd.prefs.mk"
  .include "options.mk"

  .include "../../mk/bsd.pkg.mk"