fatal error: proj.h: No such file or directory

[lithium555]

Hi!
I have such error:

go build cmd/main.go
# github.com/omniscale/go-proj/v2
/root/go/pkg/mod/github.com/omniscale/go-proj/[email protected]/proj.go:47:11: fatal error: proj.h: No such file or directory
 // #include <proj.h>
           ^~~~~~~~
compilation terminated.

First of all we need to install PROJ library:

sudo apt-get update
sudo apt-get install libproj-dev


root@2cabef130881:/app/src# apt-get update
Hit:1 http://ports.ubuntu.com/ubuntu-ports bionic InRelease
Get:2 http://ports.ubuntu.com/ubuntu-ports bionic-updates InRelease [88.7 kB]
Get:3 http://ports.ubuntu.com/ubuntu-ports bionic-backports InRelease [83.3 kB]
Get:4 http://ports.ubuntu.com/ubuntu-ports bionic-security InRelease [88.7 kB]
Fetched 261 kB in 1s (205 kB/s)                             
Reading package lists... Done
root@2cabef130881:/app/src# apt-get install libproj-dev
Reading package lists... Done
Building dependency tree       
Reading state information... Done
libproj-dev is already the newest version (4.9.3-2).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

After that we should find out file proj.h in our system. We should write a command find / -name proj.h 2>/dev/null, but I have no results after that. Typically the proj.h file is located in the /usr/include directory
But he's not there...

If the proj.h file is available, then in our case, go-proj should know about the presence of the PROJ library. This is usually configured through the CGO_CFLAGS and CGO_LDFLAGS environment variables.

In theory it should be:

export CGO_CFLAGS="-I/usr/include"
export CGO_LDFLAGS="-L/usr/lib"

In my code I use import "github.com/omniscale/go-proj/v2" maybe we should write comething new in library ?