Hi @juanmachado,
please don’t post the same message twice in two old topics for a new issue next time.
It seems your INSTALL_PREFIX is set to /opt/gvm. In that case you need to adjust the pkg-config search path by setting the environment variable PKG_CONFIG_PATH to /opt/gvm/pkgconfig.
Btw. when building from source it is best to follow our guide at https://greenbone.github.io/docs/
If you don’t know all the details of the build toolchain (for example how executables are found, linked and loaded) it is very very difficult to fix issues like this. And you WILL run in such issues again!