+# Save common compilation flags into temporary variables.
+#
+# Compilation flags includes: CPPFLAGS, CFLAGS, CXXFLAGS, LDFLAGS, LIBS,
+# OBJCFLAGS.
+#
+# By default these flags are saved to a global (empty) namespace, but user
+# could specify a specific NAMESPACE to AX_SAVE_FLAGS macro and latter
+# restore it by using AX_RESTORE_FLAGS(NAMESPACE).
+#
+# AX_SAVE_FLAGS(mypackage)
+# CPPFLAGS="-Imypackagespath ${CPPFLAGS}"
+# dnl .. do some detection ...
+# AX_RESTORE_FLAGS(mypackage)