no rule to make libXt.so

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http://forums.fedoraforum.org – Hi, I am compiling a software with cmake 2.8.4 on scientific linux 6. When I run make, there are many error messages like Code: No rule to make target `/usr/lib64/libXt.so', needed by `bin/MRASegmentationEx'.  Stop. There is no libXt.so in /usr/lib64, but libXt.so.6 and libXt.so.6.0.0. I also checked with ldd what libraries does MRASegmentationEx need. No libXt.so. libXt-1.0.7-1.el6.x86_64 has been installed. any comments? Thanks. (HowTos)