README-release: Update compiler environment variable

When compiling C++ code, CXX should be used to set the compiler
to g++ instead of CC, which is for setting a C compiler.

diff --git a/gl/top/README-release.diff b/gl/top/README-release.diff
index 8bcc2c9103ab2c47fb2bc689dc99a17f8d600311..d9771ba6fd1d80aa239670ddeef612bdb957241e 100644 (file)
--- a/gl/top/README-release.diff
+++ b/gl/top/README-release.diff
@@ -30,7 +30,7 @@
 +    make distcheck DISTCHECK_CONFIGURE_FLAGS=--disable-ltdl-install
 +    make distcheck DISTCHECK_CONFIGURE_FLAGS=--program-prefix=g
 +    make distcheck DISTCHECK_CONFIGURE_FLAGS=--disable-shared
-+    make distcheck CC=g++
++    make distcheck CXX=g++
 +
 +  If there are any problems, fix them and start again.