| Build System | Environment variables setting |
| xlC on AIX4.1.5 | CC=/usr/lpp/xlC/bin/xlc CXX=/usr/lpp/xlC/bin/xlC_r |
| native CC compiler on Solaris | |
| GNU C++ compiler on Solaris | |
| GNU C++ compiler on Linux | CXX=g++ CC=gcc CXXFLAGS=-g CFLAGS=-g |
| native C++ compiler on HP-UX10.2 | CC=cc CXX=CC |
| Advanced C++ compiler on HP-UX10.2 | CC=cc CXX=aCC |
| native C++ compiler on HP-UX11 | |
| Advanced C++ compiler on HP-UX11 | CC=cc CXX=aCC |
| xlC on AIX4.3 | CC=/usr/ibmcxx/bin/xlc CXX=/usr/ibmcxx/bin/xlC_r |
| native CC compiler on Solaris | CC=/opt/SUNWspro/bin/cc CXX=/opt/SUNWspro/bin/CC |