If a package does not use GNU autoconf for platform-specific configuration, you should expect that the package uses one of these three systems:
A customizable Makefile and/or
config.h. At one time, administrators had to configure nearly all third-party Unix software by editing Makefiles. GNU autoconf has made this practice nearly extinct, but you still may come across custom configuration in older packages or very Linux-specific packages.
Imakefiles. Many X Window System applications use
imake to create Makefiles from Imakefiles.
"Anybody's guess." Some developers just have to be different.
In addition, many packages, including those using the three types listed above, now rely on the
pkg-config program for compiler and linker options. ...