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...g -c rinterface.c -o rinterface.o rinterface.c:30:15: fatal error: R.h: File or directory does not exist! compilation terminated. make: *** [rinterface.o] Error 1 ERROR: compilation failed for package ?igraph? * removing ?/usr/lib64/R/library/igraph? The downloaded source packages are in ?/tmp/RtmpSFsTPv/downloaded_packages? Updating HTML index of packages in '.Library' Making packages.html ... done Warning message: In install.packages("igraph") : installation of package ?igraph? had non-zero exit status --snip-- And yes, I have asked Mr. Google, but none of the suggested so...