Build input file cannot be found: '/opt/local/lib/libpng16.a'

[lifepillar]

I am trying to build develop's head in Xcode 10.1 and macOS 10.14.2. The build fails with the following error:

Libtool /Users/me/Library/Developer/Xcode/DerivedData/OpenEmulator-dghiwjfipkoadieueibnirgqjzlh/Build/Products/Debug/libemulation.a normal x86_64 (in target: emulation)
    cd /Users/me/Documents/Outbox/OpenEmulator-OSX
    export MACOSX_DEPLOYMENT_TARGET=10.9
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool -static -arch_only x86_64 -syslibroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk -L/Users/me/Library/Developer/Xcode/DerivedData/OpenEmulator-dghiwjfipkoadieueibnirgqjzlh/Build/Products/Debug -L/Users/me/Documents/Outbox/OpenEmulator-OSX/lib -L/opt/local/lib -L/usr/local/lib -filelist /Users/me/Library/Developer/Xcode/DerivedData/OpenEmulator-dghiwjfipkoadieueibnirgqjzlh/Build/Intermediates.noindex/OpenEmulator.build/Debug/emulation.build/Objects-normal/x86_64/emulation.LinkFileList -lpng16 -o /Users/me/Library/Developer/Xcode/DerivedData/OpenEmulator-dghiwjfipkoadieueibnirgqjzlh/Build/Products/Debug/libemulation.a

error: Build input file cannot be found: '/opt/local/lib/libpng16.a'

I have libpng in /usr/local/lib/libpng16.a. I have tried to remove /opt/local/lib from Library Search Paths and Framework Search Paths, but I keep getting the same error. Any idea how to fix it?

[lifepillar]

If I update Link Binary with Libraries in the Build Phases of the emulation target so that it points to an existing libpng16.a then I can build successfully. But I need to build from the command line, and I'd rather not patch the project file.

[tobier]

I'm having the same problem, so I'm starting to look into a better way of packaging dependencies.

[tobier]

Related: openemulator/libemulation#34

Will add Travis integration and update paths to build OpenEmulator in an upcoming PR.