make cannot configure protobuf and fails with aclocal: warning: couldn't open directory 'm4': No such file or directory about autofdo HOT 4 OPEN

I also have this. Anyone gotten past this?

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I'm also having this problem when building gRPC. Platform is CentOS6, compiler is GCC 5.5. I simply run the below command:

make CC=gcc55 CXX=g++55 EXTRA_CXXFLAGS="-Wno-error=unused-variable"

Cares seems to have no problems with it, so I'm not sure why protobuf can't pick up the m4 directory that's in its root folder.

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I also have this. Anyone gotten past this?

Same issue here. We build a completely self contained toolchain and so don't use system RPMs. However, libtool, autoconf, and all other gnu tools are set on the PATH and are the absolute latest versions available

Does this configure system need to upgrade from AC_PROG_LIBTOOL to LT_INIT since AC_PROG_LIBTOOL has been deprecated for quite a few years

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The solution descibed in issue #38 worked for me, i.e. changing am__api_version='1.14' to am__api_version='1.15' in the configure file

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