+CPPFLAGS="-DHAVE_CONFIG_H=1 -I$abs_top_builddir @CPPFLAGS@"
+
+# Is the compiler GCC?
+GCC='@GCC@'
+
+# The C++ compiler.
+CXX='@CXX@'
+
+# If 'exit 77'; skip all C++ tests; otherwise ':'.
+BISON_CXX_WORKS='@BISON_CXX_WORKS@'
+
+# We want no optimization with C++, too.
+CXXFLAGS='@O0CXXFLAGS@ @WARNING_CXXFLAGS@ @WERROR_CFLAGS@'
+
+# Are special link options needed?
+LDFLAGS='@LDFLAGS@'
+
+# Are special libraries needed?
+LIBS='@LIBS@'