configure.ac: error out if protoc is not found

ac71dd58 · Robert Edmonds · c797b07e · ac71dd58
Commit ac71dd58 authored Jan 11, 2014 by Robert Edmonds
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configure.ac configure.ac +3 -0

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--- a/configure.ac
+++ b/configure.ac
@@ -39,6 +39,9 @@ fi
 PKG_CHECK_MODULES([protobuf], [protobuf])
 AC_LANG_PUSH([C++])
 AC_PATH_PROG(PROTOC, protoc)
+if test -z "$PROTOC"; then
+    AC_MSG_ERROR([Please install the protobuf compiler from https://code.google.com/p/protobuf/.])
+fi

 AC_C_BIGENDIAN