+
+# Check the version of a specific autoconf macro that tends to cause problems.
+CXXMACROVERSION=$(
+ grep -B 5 'm4_define(\[_AX_CXX_COMPILE_STDCXX_11_testbody\]' aclocal.m4 |
+ sed -n 's/.*serial[ \t][ \t]*\([0-9][0-9]*\).*/\1/p'
+)
+if [ "x$CXXMACROVERSION" = "x" ]; then
+ echo "--- Warning: AX_CXX_COMPILE_STDCXX_11 macro not found."
+ echo "--- You won't be able to build the language bindings!"
+ echo "--- More info: http://sigrok.org/wiki/Building#FAQ"
+fi
+if [ "x$CXXMACROVERSION" != "x" ] && [ "$CXXMACROVERSION" -lt 4 ]; then
+ echo "--- Warning: AX_CXX_COMPILE_STDCXX_11 macro is too old."
+ echo "--- (found version $CXXMACROVERSION, at least 4 is required)"
+ echo "--- You won't be able to build the language bindings!"
+ echo "--- More info: http://sigrok.org/wiki/Building#FAQ"
+fi
+