Gentoo emerge virtualbox- Mesa / GLU: Mesa not found at, Mesa headers not found

Emerging the package app-emulation/virtualbox the following error occurs:

Checking for Mesa / GLU: 
  Mesa not found at -L/usr/X11R6/lib -L/usr/X11R6/lib64 -L/usr/local/lib -lXext -lX11 -lGL -I/usr/local/include or Mesa headers not found
  Check the file /var/tmp/portage/app-emulation/virtualbox-6.1.18/work/VirtualBox-6.1.18/configure.log for detailed error information.
Check /var/tmp/portage/app-emulation/virtualbox-6.1.18/work/VirtualBox-6.1.18/configure.log for details
 * ERROR: app-emulation/virtualbox-6.1.18::gentoo failed (configure phase):
 *   (no error message)
 * 
 * Call stack:
 *     ebuild.sh, line  125:  Called src_configure
 *   environment, line 5504:  Called doecho './configure' '--with-gcc=x86_64-pc-linux-gnu-gcc' '--with-g++=x86_64-pc-linux-gnu-g++' '--disable-dbus' '--disable-kmods' '--disable-alsa' '--disable-docs' '--disable-devmapper' '--disable-pulse' '--disable-python' '--enable-webservice' '--enable-vnc'
 *   environment, line 1538:  Called die
 * The specific snippet of code:
 *       "$@" || die

The configure script reports the mesa is missing, but the package media-libs/mesa is installed. Reinstalling does not fix the problem.
Farther investigation in the logs by checking the configure.log reveals the real problem:

srv ~ # tail -n 16 /var/tmp/portage/app-emulation/virtualbox-6.1.18/work/VirtualBox-6.1.18/configure.log
***** Checking Mesa / GLU *****
compiling the following source file:
#include <cstdio>
#include <X11/Xlib.h>
#include <GL/glx.h>
#include <GL/glu.h>
extern "C" int main(void)
{
  return 0;
}
using the following command line:
x86_64-pc-linux-gnu-g++  -fPIC -g -O -Wall -o /var/tmp/portage/app-emulation/virtualbox-6.1.18/work/VirtualBox-6.1.18/.tmp_out /var/tmp/portage/app-emulation/virtualbox-6.1.18/work/VirtualBox-6.1.18/.tmp_src.cc "-L/usr/X11R6/lib -L/usr/X11R6/lib64 -L/usr/local/lib -lXext -lX11 -lGL -I/usr/local/include"
/var/tmp/portage/app-emulation/virtualbox-6.1.18/work/VirtualBox-6.1.18/.tmp_src.cc:4:10: fatal error: GL/glu.h: No such file or directory
    4 | #include <GL/glu.h>
      |          ^~~~~~~~~~
compilation terminated.

The glu part of mesa is missing. In Gentoo, the glu (https://gitlab.freedesktop.org/mesa/glu) is not included in the media-libs/mesa and it is a separate package media-libs/glu.

The solution is to emerge media-libs/glu and then the app-emulation/virtualbox.

emerge -v media-libs/glu

Another Linux distribution may include glu in the main mesa package.

Here, the conclusion is to always check the configure.log, because it reports the exact error and not to trust the generic output of the configure script.

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