Shawn-Armstrong/#C_libpq_linking_error.md

## #C_libpq_linking_error.md

      
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#C_libpq_linking_error.md 


Issue was resolved.
Solution was performed on Ubuntu 20.04 using WSL2 for Windows10.
Compilation command needed a path to libpq resources for linking.

The default path to this directory is typically /usr/include/postgresql.


Test file

// test.c
#include <stdio.h>
#include <stdlib.h>
#include <libpq-fe.h>

int main(int argc, char **argv){
	printf("\nHello World\n\n");
	return 0;
}
Error

$ gcc test.c -lpq -o test
test.c:3:10: fatal error: libpq-fe.h: No such file or directory
    3 | #include <libpq-fe.h>
      |          ^~~~~~~~~~~~
compilation terminated.
Solution

# Required Bash commands
sudo apt update
sudo apt-get install libpq-dev
gcc test.c -I/usr/include/postgresql -lpq -o test
./test

Hello World