gcc5: gcc5 (Co-installable GCC-5 package with C, C++ and Java support) gcc5: gcc5: GCC is the GNU Compiler Collection. gcc5: gcc5: This package contains those parts of the compiler collection needed to gcc5: compile C and C++ code and programs written in the Java programming gcc5: language. gcc5: gcc5: This gcc5 package must be co-installed with Slackware's gcc7 compiler. gcc5: gcc5: