JPEG parameter struct mismatch

Question

Ater compiling libjpeg and then using it, I stumbled upon the problem:

JPEG parameter struct mismatch: library thinks size is 512, caller expects 492

after which the program halts. This happens specifically with the structs struct jpeg_decompress_struct and struct jpeg_compress_struct. If the checks are removed on these structs, the program crashes with a null pointer exception, and the struct members contain garbage.

The error occurs with either precompiled binaries from version 6b, or with precompiled version 9a, and with the compiled version 9a; compiled with MinGW, MSYS 1.0, on windows (32 bit). Messing around in the config files does not help; the number 492 can change, but never equals 512 in order for the program to function.

The libjpeg compilation did create a valid cjpeg.exe and djpeg.exe.

Any ideas?