Bug 125107

cegui won't link if lua5.1 (lang/lua) is installed:

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...
if /usr/local/libexec/ccache/cc -DHAVE_CONFIG_H -I/usr/local/include/lua51  -I. -I. -I../../../include -I/usr/local/include/lua51 -I../../../ScriptingModules/CEGUILua/tolua++   -I/usr/local/include -I/usr/local/include/lua50  -O2 -fno-strict-aliasing -pipe -march=pentium4 -MT tolua.o -MD -MP -MF ".deps/tolua.Tpo"  -c -o tolua.o `test -f 'tolua.c' || echo './'`tolua.c;  then mv -f ".deps/tolua.Tpo" ".deps/tolua.Po";  else rm -f ".deps/tolua.Tpo"; exit 1;  fi
if /usr/local/libexec/ccache/cc -DHAVE_CONFIG_H -I/usr/local/include/lua51  -I. -I. -I../../../include -I/usr/local/include/lua51 -I../../../ScriptingModules/CEGUILua/tolua++   -I/usr/local/include -I/usr/local/include/lua50  -O2 -fno-strict-aliasing -pipe -march=pentium4 -MT toluabind.o -MD -MP -MF ".deps/toluabind.Tpo"  -c -o toluabind.o `test -f 'toluabind.c' || echo './'`toluabind.c;  then mv -f ".deps/toluabind.Tpo" ".deps/toluabind.Po";  else rm -f ".deps/toluabind.Tpo"; exit 1;  fi
/bin/sh ../../../libtool --mode=link /usr/local/libexec/ccache/cc  -O2 -fno-strict-aliasing -pipe -march=pentium4   -L/usr/local/lib -L/usr/local/lib/lua50 -o tolua++cegui -L../../../ScriptingModules/CEGUILua/tolua++/.libs tolua.o toluabind.o -lCEGUItoluapp -pthread
mkdir .libs
/usr/local/libexec/ccache/cc -O2 -fno-strict-aliasing -pipe -march=pentium4 -o tolua++cegui tolua.o toluabind.o -pthread  -L/usr/local/lib -L/usr/local/lib/lua50 -L/usr/work/.amd_mnt/hive/pool/ports/graphics/cegui/work/CEGUI-0.6.0/ScriptingModules/CEGUILua/tolua++/.libs /usr/local/lib/libCEGUItoluapp.so -L/usr/local/lib/lua51 -llua -lm   -Wl,--rpath -Wl,/usr/local/lib -Wl,--rpath -Wl,/usr/local/lib
tolua.o(.text+0x8e): In function `main':
: undefined reference to `luaL_openlibs'
*** Error code 1

Stop in /usr/work/.amd_mnt/hive/pool/ports/graphics/cegui/work/CEGUI-0.6.0/ScriptingModules/CEGUILua/tolua++bin.
*** Error code 1
---

This happens because cegui's configure erroneously gets include and library paths for wrong version of lua from pkg-config.

Fix: 

Either
1) Patch configure so it doesn't detect lua51.
or
2) Use lua 5.1 for CEGUI (not tested with real apps)
How-To-Repeat: Install lang/lua, try to build CEGUI