fix gcc cross-compile

package/gcc/Makefile

@@ -10,6 +10,19 @@ PKG_OPTS:=		noremove
 PKG_DEPENDS:=		libgmp mpfr
 PKG_BUILDDEP+=		gmp mpfr
 
+ifeq ($(ADK_TARGET_LIB_UCLIBC),y)
+PKG_DEPENDS:=		uclibc-dev
+PKG_BUILDDEP+=		uclibc
+endif
+ifeq ($(ADK_TARGET_LIB_EGLIBC),y)
+PKG_DEPENDS:=		eglibc-dev
+PKG_BUILDDEP+=		eglibc
+endif
+ifeq ($(ADK_TARGET_LIB_GLIBC),y)
+PKG_DEPENDS:=		glibc-dev
+PKG_BUILDDEP+=		glibc
+endif
+
 PKG_HOST_DEPENDS:=	!freebsd
 
 include ${TOPDIR}/mk/package.mk