Cygwin64 libjpeg-turbo missing/damaged library file

[Bill Hammond]

I am having trouble compiling an application that uses the libjpeg libraries under cygwin64.

My program has compiled and run under cygwin32 for a long time. I can compile and run it under cygwin64 when I build and link against my own libjpeg.a. When I try and download the libjpeg-turbo libraries for cygwin64, it all comes apart. The "libjpeg-turbo" package is source only, and when I install "libjpeg-devel" and link against it with "-ljpeg", all the jpeg function calls are undefined.
I am using the cygwin64 installer. Is there a problem with the cygwin64 libjpeg package(s), or am I not doing something right? 		 	   		  
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