vendor/github.com/gen2brain/go-fitz/fitz.go:9:10: fatal error: 'mupdf/fitz.h' file not found

[thynquest]

Hello there

May be this case was already treated but I can't find a way around this. I am trying to compile a basic example using this library but nothing seems to work. this is the command I use

go build -tags "extlib" -o bin/sample main.go.

Of course I installed mupdf first using homebrew (I am on macos) but the build does not work. I also tried to add env variable such as LIBRARY_PATH or LDFLAGS but with no result. the basic example I am trying to compile is the one on the project page. Based on what I have understood the could be a way to build just by using the bundled library..
any leads that can point me to the right direction ?
thanks for the help.

[gen2brain]

Seems you are trying to use both vendor and extlib? Remove vendor, it will not copy all necessary files. If you want to pass additional LDFLAGS/CFLAGS that is done by using CGO_CFLAGS and CGO_LDFLAGS. You can search issues to see how it is done in Dockefile if you want to use an external library.

[gen2brain]

Btw. you can use an external library, that is why there is a tag for that, not sure how you understood that the bundled library is the only way.

$ go mod init example
$ go mod tidy
$ go build -tags extlib
$ ldd ./example 
	linux-vdso.so.1 (0x00007ffd181c8000)
	libmupdf.so.1.19.0 => /usr/lib64/libmupdf.so.1.19.0 (0x00007f65b7835000)
	libm.so.6 => /lib64/libm.so.6 (0x00007f65b7760000)
	libc.so.6 => /lib64/libc.so.6 (0x00007f65b7563000)
	libfreetype.so.6 => /usr/lib64/libfreetype.so.6 (0x00007f65b749b000)
	libgumbo.so.1 => /usr/lib64/libgumbo.so.1 (0x00007f65b743c000)
	libharfbuzz.so.0 => /usr/lib64/libharfbuzz.so.0 (0x00007f65b7343000)
	libjpeg.so.62 => /usr/lib64/libjpeg.so.62 (0x00007f65b72af000)
	libz.so.1 => /lib64/libz.so.1 (0x00007f65b7295000)
	libjbig2dec.so.0 => /usr/lib64/libjbig2dec.so.0 (0x00007f65b7275000)
	libopenjp2.so.7 => /usr/lib64/libopenjp2.so.7 (0x00007f65b7216000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f65ba692000)
	libbz2.so.1 => /lib64/libbz2.so.1 (0x00007f65b7203000)
	libpng16.so.16 => /usr/lib64/libpng16.so.16 (0x00007f65b71cc000)
	libgraphite2.so.3 => /usr/lib64/libgraphite2.so.3 (0x00007f65b71a4000)
	libglib-2.0.so.0 => /usr/lib64/libglib-2.0.so.0 (0x00007f65b706d000)
	libpcre.so.1 => /lib64/libpcre.so.1 (0x00007f65b6ff6000)

Did you install static only library? In that case also add static tag, i.e. tags 'extlib static'.

[gen2brain]

Right, so brew installs only static libraries, this is from Catalina VM but probably the same on your OS.

% brew ls --verbose mupdf | grep lib
/usr/local/Cellar/mupdf/1.19.1/lib/libmupdf.a
/usr/local/Cellar/mupdf/1.19.1/lib/libmupdf-third.a

% ls -1
example.go
go.mod
go.sum
test.pdf

% go build -o example-embed

% go build -tags 'extlib static' -o example

% otool -L example-embed 
example-embed:
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1281.100.1)

% otool -L example
example:
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1281.100.1)

% ./example