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/usr/lib/x86_64-linux-gnu/pkgconfig/lua5.1.pc is in liblua5.1-0-dev 5.1.5-8ubuntu1.

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prefix=/usr
major_version=5.1
version=5.1.5
lib_name_include=lua5.1
deb_host_multiarch=x86_64-linux-gnu
#prefix=/usr
#major_version=5.1
#version=5.1.0
#deb_host_multiarch=x86_64-linux-gnu

lib_name=lua${major_version}
libdir=${prefix}/lib/${deb_host_multiarch}
includedir=${prefix}/include

#
# The following are intended to be used via "pkg-config --variable".

# Install paths for Lua modules.  For example, if a package wants to install
# Lua source modules to the /usr/local tree, call pkg-config with
# "--define-variable=prefix=/usr/local" and "--variable=INSTALL_LMOD".
INSTALL_LMOD=${prefix}/share/lua/${major_version}
INSTALL_CMOD=${prefix}/lib/${deb_host_multiarch}/lua/${major_version}

Name: Lua
Description: Lua language engine
Version: ${version}
Requires:
Libs: -L${libdir} -l${lib_name}
Libs.private: -lm -ldl
Cflags: -I${includedir}/${lib_name_include}