Hi, Here are two logs for building emacs on my fc20 system. One with libjpeg and one with the "--with-jpeg=no" flag. There are some other warnings that might be of interest in these logs. Here's what I have for libjpeg on this system: libjpeg-turbo-1.3.1-2.fc20.x86_64 libjpeg-turbo-devel-1.3.1-2.fc20.x86_64 libjpeg-turbo-utils-1.3.1-2.fc20.x86_64 mingw64-libjpeg-turbo-1.3.1-1.fc20.noarch My input to configure is in the log files. Regards and again, thanks, for your time and help with this issue. From: Eli Zaretskii To: Glenn Morris Cc: jan.h.d@swipnet.se; grgoffe@yahoo.com; 18552@debbugs.gnu.org Sent: Wednesday, October 1, 2014 11:25 AM Subject: Re: bug#18552: Possible bug building emacs trunk with Fedora 19-x86_64 > From: Glenn Morris > Cc: Eli Zaretskii ,  grgoffe@yahoo.com,  18552@debbugs.gnu.org > Date: Wed, 01 Oct 2014 14:13:08 -0400 > > > So was any conclusion reached here? I tend to think the OP's system is misconfigured.  32-bit vs 64-bit messup is one possibility. Another way to continue investigating this is for the OP to try compiling a short test program that includes the JPEG header, and see if it compiles, and if not, what warning/error messages appear.  The log the OP sent says just   configure:12340: WARNING: libjpeg found, but not version 6b or later which isn't very informative.