makefile.amiga => Amiga makefile
makefile.atari => Atari makefile
makefile.clang => Generic clang makefile
makefile.emcc => Emscripten makefile
makefile.gcc => Generic gcc makefile
makefile.ibmc => IBM C/C++ version 3.x for Win32 and OS/2
makefile.intel => Intel C/C++ version 4.0 and later
makefile.riscos => Acorn RISCOS makefile
makefile.std => Generic UNIX makefile
makefile.vcwin32 => Microsoft Visual C++ for Windows/x86
makefile.vcwin-arm64 => Microsoft Visual C++ for Windows/ARM64
makevms.com => VMS build script
descrip.mms => VMS makefile for MMS or MMK
smakefile.ppc => AMIGA smakefile for SAS C V6.58/7.00 PPC compiler
(Requires SCOPTIONS, copied from SCOPTIONS.ppc)
SCOPTIONS.ppc => Used with smakefile.ppc
libpng-config-body.in => Used by several makefiles to create libpng-config libpng-config-head.in => Used by several makefiles to create libpng-config libpng.pc.in => Used by several makefiles to create libpng.pc macro.lst => Used by GNU Autotools pngwin.rc => Used by the Visual Studio project README.txt => This file
Further information can be found in comments in the individual scripts and makefiles.