/opt/gnu から cd make-3.79.1 sh .configure --prefix=/opt/gnu
とすると
# sh ./configure --prefix=/opt/gnu loading cache ./config.cache checking for a BSD compatible install... ./install-sh -c checking whether build environment is sane... yes checking whether make sets ${MAKE}... ./configure: make: not found no checking for working aclocal... missing checking for working autoconf... missing checking for working automake... missing checking for working autoheader... missing checking for working makeinfo... missing checking host system type... i386-pc-solaris2.8 checking whether make sets ${MAKE}... (cached) no checking for gcc... no checking for cc... no configure: error: no acceptable cc found in $PATH