#12 x86_64 CPU is not recognized

[Felix Almeida]

While compiling release 6b on a Linux box (RHEL4 in my case) I get the following error message:

$ ./configure --enable-shared --enable-static
...
checking for ranlib... ranlib
checking host system type... Invalid configuration `x86_64-unknown-linux-gnu': machine `x86_64-unknown' not recognized

The way that I found to fix this was to add this CPU (x86_64) to config.sub file like the following:

*** config.sub.orig     2015-09-14 15:19:45.000000000 -0400
--- config.sub  2015-09-14 15:23:21.000000000 -0400
***************
*** 171,177 ****
                exit 1
                ;;
        # Recognize the basic CPU types with company name.
!       vax-* | tahoe-* | i[3456]86-* | i860-* | m32r-* | m68k-* | m68000-* \
              | m88k-* | sparc-* | ns32k-* | fx80-* | arc-* | arm-* | c[123]* \
              | mips-* | pyramid-* | tron-* | a29k-* | romp-* | rs6000-* \
              | power-* | none-* | 580-* | cray2-* | h8300-* | i960-* \
--- 171,177 ----
                exit 1
                ;;
        # Recognize the basic CPU types with company name.
!       vax-* | tahoe-* | i[3456]86-* | x86_64-* | i860-* | m32r-* | m68k-* | m68000-* \
              | m88k-* | sparc-* | ns32k-* | fx80-* | arc-* | arm-* | c[123]* \
              | mips-* | pyramid-* | tron-* | a29k-* | romp-* | rs6000-* \
              | power-* | none-* | 580-* | cray2-* | h8300-* | i960-* \

[Bob Friesenhahn]

This project is a dead project. Look at http://www.ijg.org/ or http://www.libjpeg-turbo.org/ for projects which are still alive. The former is the official IJG version and supports major new features (rarely used) and the latter is a performance refinement of the 6b version to be quite a lot faster. There is also the Mozilla JPEG project at https://github.com/mozilla/mozjpeg, which focuses on producing smaller files.