Index: java/openjdk8/Makefile
===================================================================
--- java/openjdk8/Makefile	(revision 403432)
+++ java/openjdk8/Makefile	(working copy)
@@ -268,6 +268,18 @@ JDK_BUILD_TYPE=		release
 
 AUTOCONF_ARGS=	-I . -o generated-configure.sh generated-configure.ac
 
+# XXX configure script rejects CC/CPP/CXX with absolute paths.
+.for t in CC CPP CXX
+.if defined(${t}) && ${${t}:M/*}
+BUILD_${t}=	${${t}:C|.*/||g}
+CONFIGURE_ENV+=	${t}="${BUILD_${t}}"
+TOOLS_DIR+=	${${t}:S|/${BUILD_${t}}$||}
+.endif
+.endfor
+.if defined(TOOLS_DIR)
+CONFIGURE_ARGS+=	--with-tools-dir="${TOOLS_DIR:u:S/ /:/g}"
+.endif
+
 .include <bsd.port.pre.mk>
 
 .if ${ARCH} == "armv6"
@@ -324,7 +336,7 @@ MAKE_ENV+=	COMPILER_WARNINGS_FATAL=false
 .endif
 MAKE_ENV+=	USE_CLANG=true
 .if ${COMPILER_FEATURES:Mlibc++}
-CONFIGURE_ENV=	LIBCXX="-lc++"
+CONFIGURE_ENV+=	LIBCXX="-lc++"
 .endif
 .endif