gource fails to find installed glew (on PPC system): configure: error: Package requirements (glew) were not met: No package 'glew' found

[barracuda156]

checking GL/gl.h usability... yes
checking GL/gl.h presence... yes
checking for GL/gl.h... yes
checking for compiling a minimal OpenGL program... yes
checking for linking a minimal OpenGL program... yes
checking for OpenGL/glu.h... yes
checking for compiling a minimal OpenGL Utility (GLU) program... yes
checking for linking a minimal GLU program... yes
checking if GLU varargs tesselator is using non-standard form... no
checking for FT2... yes
checking for PCRE2... yes
checking for GLEW... configure: error: Package requirements (glew) were not met:

No package 'glew' found

Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.

Alternatively, you may set the environment variables GLEW_CFLAGS
and GLEW_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.

Command failed:  cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_gource/gource/work/gource-0.54" && ./configure --prefix=/opt/local --with-boost=/opt/local/libexec/boost/1.76 --with-tinyxml 
Exit code: 1
Error: Failed to configure gource: consult /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_gource/gource/work/gource-0.54/config.log
Error: Failed to configure gource: configure failure: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_gource/gource/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets if you believe there
is a bug.
Error: Processing of port gource failed

glew is installed, however:

36-25% port installed glew
The following ports are currently installed:
  glew @2.2.0_0 (active)

16. S. If old systems cannot be supported, the port should be restricted to what works in terms of archs and OS.