], [dnl M4 code follows
AC_SUBST([GLSRC], [lib])
-AC_DEFUN_ONCE([DX_GLSYM_PREFIX], [AC_SUBST([GLSYM_PREFIX], [$1])])
+
+AC_DEFUN_ONCE([DX_GLSYM_PREFIX], [dnl
+AC_REQUIRE([DX_EXPORTED_SH])
+AC_SUBST([GLSYM_PREFIX], [$1])
+])
AC_CONFIG_COMMANDS_PRE([DX_GLSYM_PREFIX([${PACKAGE}__])])
m4_foreach([gl_objvar], [[gl_LIBOBJS], [gl_LTLIBOBJS]], [dnl