Makefiles for libpng

pnglibconf.h.prebuilt  =>  Configuration settings
 makefile.linux    =>  Linux/ELF makefile
                       (gcc, creates shared libpng16.so.16.1.6.*)
 makefile.linux-opt=>  Linux/ELF makefile with hardware optimizations on
                       (gcc, creates shared libpng16.so.16.1.6.*)
 makefile.gcc      =>  Generic makefile (gcc, creates static libpng.a)
 makefile.acorn    =>  Acorn makefile
 makefile.aix      =>  AIX/gcc makefile
 makefile.amiga    =>  Amiga makefile
 makefile.atari    =>  Atari makefile
 makefile.bc32     =>  32-bit Borland C++ (all modules compiled in C mode)
 makefile.beos     =>  BeOS makefile
 makefile.cegcc    =>  minge32ce for Windows CE makefile
 makefile.darwin   =>  Darwin makefile, for macOS (formerly Mac OS X)
 makefile.dec      =>  DEC Alpha UNIX makefile
 makefile.dj2      =>  DJGPP 2 makefile
 makefile.freebsd  =>  FreeBSD makefile
 makefile.gcc      =>  Generic gcc makefile
 makefile.hpgcc    =>  HPUX makefile using gcc
 makefile.hpux     =>  HPUX (10.20 and 11.00) makefile
 makefile.hp64     =>  HPUX (10.20 and 11.00) makefile, 64-bit
 makefile.ibmc     =>  IBM C/C++ version 3.x for Win32 and OS/2 (static)
 makefile.intel    =>  Intel C/C++ version 4.0 and later
 makefile.mips     =>  MIPS makefile
 makefile.netbsd   =>  NetBSD/cc makefile, makes shared libpng.so
 makefile.openbsd  =>  OpenBSD makefile
 makefile.sco      =>  SCO OSr5 ELF and Unixware 7 with Native cc
 makefile.sggcc    =>  Silicon Graphics makefile
                       (gcc, creates shared libpng16.so.16.1.6.*)
 makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
 makefile.solaris  =>  Solaris 2.X makefile
                       (gcc, creates shared libpng16.so.16.1.6.*)
 makefile.so9      =>  Solaris 9 makefile
                       (gcc, creates shared libpng16.so.16.1.6.*)
 makefile.std      =>  Generic UNIX makefile (cc, creates static libpng.a)
 makefile.sunos    =>  Sun makefile
 makefile.32sunu   =>  Sun Ultra 32-bit makefile
 makefile.64sunu   =>  Sun Ultra 64-bit makefile
 makefile.vcwin32  =>  makefile for Microsoft Visual C++ 4.0 and later
 makevms.com       =>  VMS build script
 smakefile.ppc     =>  AMIGA smakefile for SAS C V6.58/7.00 PPC compiler
                       (Requires SCOPTIONS, copied from scripts/SCOPTIONS.ppc)

Other supporting scripts:
 README.txt        =>  This file
 descrip.mms       =>  VMS makefile for MMS or MMK
 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
 pngwin.rc         =>  Used by the visualc71 project
 pngwin.def        =>  Used by makefile.os2
 pngwin.dfn        =>  Used to maintain pngwin.def
 SCOPTIONS.ppc     =>  Used with smakefile.ppc

 checksym.awk      =>  Used for maintaining pnglibconf.h
 def.dfn           =>  Used for maintaining pnglibconf.h
 options.awk       =>  Used for maintaining pnglibconf.h
 pnglibconf.dfa    =>  Used for maintaining pnglibconf.h
 pnglibconf.mak    =>  Used for maintaining pnglibconf.h
 sym.dfn           =>  Used for symbol versioning
 symbols.def       =>  Used for symbol versioning
 symbols.dfn       =>  Used for symbol versioning
 vers.dfn          =>  Used for symbol versioning

 libtool.m4        =>  Used by autoconf tools
 ltoptions.m4      =>  Used by autoconf tools
 ltsugar.m4        =>  Used by autoconf tools
 ltversion.m4      =>  Used by autoconf tools
 lt~obsolete.m4    =>  Used by autoconf tools

 intprefix.dfn     =>  Used by autoconf tools
 macro.lst         =>  Used by autoconf tools
 prefix.dfn        =>  Used by autoconf tools


Further information can be found in comments in the individual makefiles.