"--with-quantum-depth=32" breaks XPM export
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#257 "--with-quantum-depth=32" breaks XPM export
If graphicsmagick is compiled with "--with-quantum-depth=32", then the created XPM files are corrupted. The reason seems to be, that 32bit colors aren't allowed in XPM files. GIMP just displays the resulting images as black region.
This affects all userspace tools, Magick++ and PerlMagick.
This bug was fixed shortly before the 1.3.19 release. There will be other depth issues when using the Q32 build. More care is required if interoperability with other software needs to be assured.