Please consider the following trivial patch to the glew package which corrects an issue on ppc64le:
config/config.guess: unable to guess system type

Version-Release number:
glew-1.10.0

How reproducible:
build with --target ppc64le

spec changes:
--- glew.spec.ori
+++ glew.spec
@@ -9,6 +9,7 @@ URL:            http://glew.sourceforge.
 Source0:        http://downloads.sourceforge.net/project/glew/glew/%{version}/glew-%{version}.tgz
 Patch0:                0001-BUILD-respect-DESTDIR-variable.patch
 Patch1:         glew-1.9.0-makefile.patch
+Patch2:         glew-1.10.0-ppc64le-support.patch
 BuildRequires:  libGLU-devel

 %description
@@ -51,6 +52,7 @@ libGLEWmx
 %setup -q
 %patch0 -p1 -b .bld
 %patch1 -p1 -b .make
+%patch2 -p1 -b .ppc64le

 sed -i -e 's/\r//g' config/config.guess


new glew-1.10.0-ppc64le-support.patch patch:
--- glew-1.10.0/config/config.guess.ori
+++ glew-1.10.0/config/config.guess
@@ -965,6 +965,9 @@ EOF
     ppc64:Linux:*:*)
        echo powerpc64-unknown-linux-gnu
        exit ;;
+    ppc64le:Linux:*:*)
+       echo powerpc64le-unknown-linux-gnu
+       exit ;;
     ppc:Linux:*:*)
        echo powerpc-unknown-linux-gnu
        exit ;;