-# use system libs instead
-%{__rm} -r thirdparty/{curl,freetype,glfw,jbig2dec,jpeg,mujs,openjpeg,zlib}
+# use system libs instead:
+# curl 7.51.0
+# freetype 2.9.1
+# harfbuzz 1.9.0 + git update (nothing crucial)
+# jbig2dec 0.14
+# libjpeg 9
+# mujs ?
+# openjpeg 2.3.0
+# zlib 1.2.11
+%{__rm} -r thirdparty/{curl,freetype,jbig2dec,libjpeg,mujs,openjpeg,zlib}
+# but keep:
+# freeglut - 3.0.0 + some additional keyboard and clipboard APIs
+# lcms2 - "art" fork with tread safety