Override an external package's cgo compiler and linker flags?
cgo, go
Solution
You can do this by setting the `CGO_CPPFLAGS` and `CGO_LDFLAGS` environment variables.
For example, on my MacBook, Homebrew is installed in `~/.homebrew` (instead of `/usr/local`), so when I try to `go get` packages with native bindings they can't find the headers and libs.
To fix that I added these two lines to my `~/.zshenv` file:
export CGO_CPPFLAGS="-I $BREW_HOME/include"
export CGO_LDFLAGS="-L $BREW_HOME/lib"
Problem
Let's say I want to use some awesome go package. I can include it by: ``` import "github.com/really-awesome/project/foobar" ``` And inside that project's foobar.go file, it defines some `cgo` instructions like: ``` #cgo windows CFLAGS: -I C:/some-path/Include #cgo windows LDFLAGS: -L C:/some-path/Lib -lfoobar ``` But if I have that `foobar` C dependency installed somewhere else, I would really need those lines to say: ``` #cgo windows CFLAGS: -I C:/different-path/Include #cgo windows LDFLAGS: -L C:/different-path/Lib -lfoobar ``` Is there a way to override or trump where `cgo` is looking for these dependencies? Right now my fix is to manually edit those two lines after running `go get ./...` which will fetch the `github.comreally-awesome/project/foobar` code. NOTE: I'm using the `MinGw` compiler, though I doubt that matters. update: I have tried adding flags to go build to no avail: ``` go build -x -gcflags="-I C:/different/include -L C:/different-path/lib -lfoobar" go build -x -ccflags="-I C:/different/include" -ldflags="-L C:/different-path/lib -lfoobar" ``` With the `-x` argument I see the printout of flags and they don't include the ones I am setting on the command line. Perhaps the `#cgo CFLAGS/LDFLAGS` statements at the top of the external go package squash what I am telling it to use...