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Date:	Tue, 30 Dec 2025 06:50:22 +0000
To:	Marco Atzeri via Cygwin <cygwin AT cygwin DOT com>
Subject:	Pillow also wants libjpeg-devel (Was Re: Failure to link with
	libjpeg.a..
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On Mon, 29 Dec 2025, Marco Atzeri via Cygwin wrote:

> On 29/12/2025 17:42, Roger Leigh via Cygwin wrote:
> > Hi,

> > I’m trying to test libtiff on Cygwin, and I’m running into a failure.  It’s finding and linking on all platforms with the exception of Cygwin (including MinGW64 and MSVC).  For example:

> > https://gitlab.com/libtiff/libtiff/-/pipelines/2236584193

> > -- Found ZLIB: /usr/lib/libz.dll.a (found version "1.3.1")
> > -- Found Deflate: /usr/lib/libdeflate.dll.a (found version "1.25")
> > CMake Error at /usr/lib/cmake/libjpeg-turbo/libjpeg-turboTargets.cmake:99 (message):
> > The imported target "libjpeg-turbo::jpeg" references the file
> > "/usr/lib/libjpeg.dll.a"
> > but this file does not exist. Possible reasons include:
> > * The file was deleted, renamed, or moved to another location.
> > * An install or uninstall procedure did not complete successfully.
> > * The installation package was faulty and contained
> > "/usr/lib/cmake/libjpeg-turbo/libjpeg-turboTargets.cmake"
> > but not all the files it references.
> > Call Stack (most recent call first):
> > /usr/lib/cmake/libjpeg-turbo/libjpeg-turboConfig.cmake:37 (include)
> > cmake/JPEGCodec.cmake:36 (find_package)

> > It is entirely correct.  The file that’s mentioned in the installed CMake config file does not exist.

> > $ find lib -name '*jpeg*'
> > lib/cmake/libjpeg-turbo
> > lib/cmake/libjpeg-turbo/libjpeg-turboConfig.cmake
> > lib/cmake/libjpeg-turbo/libjpeg-turboConfigVersion.cmake
> > lib/cmake/libjpeg-turbo/libjpeg-turboTargets-relwithdebinfo.cmake
> > lib/cmake/libjpeg-turbo/libjpeg-turboTargets.cmake
> > lib/gdk-pixbuf-2.0/2.10.0/loaders/cygpixbufloader-jpeg.dll
> > lib/libopenjpeg.dll.a
> > lib/libturbojpeg.dll.a
> > lib/openjpeg-1.5
> > lib/pkgconfig/libopenjpeg.pc
> > lib/pkgconfig/libopenjpeg1.pc
> > lib/pkgconfig/libturbojpeg.pc

> > $ find bin -name '*jpeg*'
> > bin/cygjpeg-8.dll
> > bin/cygopenjpeg-1.dll
> > bin/cygturbojpeg-0.dll

> > So the DLL exists, but the import library does not.  Everything else is present and correct as far as I can tell, but something is not right here.  The import library is missing.

> > $ grep '\.a' lib/cmake/libjpeg-turbo/*
> > lib/cmake/libjpeg-turbo/libjpeg-turboTargets-relwithdebinfo.cmake:  IMPORTED_IMPLIB_RELWITHDEBINFO "${_IMPORT_PREFIX}/lib/libjpeg.dll.a"
> > lib/cmake/libjpeg-turbo/libjpeg-turboTargets-relwithdebinfo.cmake:list(APPEND _cmake_import_check_files_for_libjpeg-turbo::jpeg "${_IMPORT_PREFIX}/lib/libjpeg.dll.a" "${_IMPORT_PREFIX}/bin/cygjpeg-8.dll" )
> > lib/cmake/libjpeg-turbo/libjpeg-turboTargets-relwithdebinfo.cmake:  IMPORTED_IMPLIB_RELWITHDEBINFO "${_IMPORT_PREFIX}/lib/libturbojpeg.dll.a"
> > lib/cmake/libjpeg-turbo/libjpeg-turboTargets-relwithdebinfo.cmake:list(APPEND _cmake_import_check_files_for_libjpeg-turbo::turbojpeg "${_IMPORT_PREFIX}/lib/libturbojpeg.dll.a" "${_IMPORT_PREFIX}/bin/cygturbojpeg-0.dll" )

> > Because it’s referenced in the configuration, and has the DLL, and everything but this file is installed, this looks like a packaging error hence reporting it here as a bug.

> install libjpeg-devel

Pillow, a dependency of the python mastodon TUI app, 
mastui also requires libjpeg-devel.

	RequiredDependencyException:

	The headers or library files could not be found for jpeg,
	a required dependency when compiling Pillow from source.


> https://cygwin.com/cgi-bin2/package-cat.cgi?file=x86_64%2Flibjpeg-devel%2Flibjpeg-devel-3.1.3-1&grep=libjpeg.dll.a



> > Kind regards,
> > Roger



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