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diff -ura old/configure.ac new/configure.ac
--- old/configure.ac 2018-12-29 14:49:21.496661046 -0500
+++ new/configure.ac 2018-12-29 14:45:04.066215239 -0500
@@ -25,17 +25,32 @@
PKG_CHECK_MODULES(LIBAVCODEC, libavcodec)
PKG_CHECK_MODULES(LIBAVFORMAT, libavformat)
PKG_CHECK_MODULES(LIBAVUTIL, libavutil)
-PKG_CHECK_MODULES(LIBGFLAGS, libgflags)
PKG_CHECK_MODULES(LIBGLOG, libglog)
PKG_CHECK_MODULES(LIBPNG, libpng)
PKG_CHECK_MODULES(LIBSWSCALE, libswscale)
-AC_CHECK_PROGS(FREETYPE, freetype-config)
-if test -z "$FREETYPE"; then
- AC_MSG_ERROR([error: libfreetype-dev is required])
+LIBGFLAGS_CFLAGS=""
+AC_CHECK_HEADER([gflags/gflags.h], [
+ AC_CHECK_LIB(gflags_nothreads, main, [
+ LIBGFLAGS_LIBS="-lgflags_nothreads"
+ ], [
+ AC_CHECK_LIB(gflags, main, [
+ LIBGFLAGS_LIBS="-lgflags"
+ ], [
+ AC_MSG_ERROR([error: libgflags_nothreads or libgflags are required])
+ ])
+ ])
+], [
+ AC_MSG_ERROR([error: libgflags headers are required])
+])
+AC_SUBST(LIBGFLAGS_CFLAGS)
+AC_SUBST(LIBGFLAGS_LIBS)
+
+if ! pkgconf --exists freetype2; then
+ AC_MSG_ERROR([error: freetype2 is required])
fi
-LIBFREETYPE_CFLAGS="`$FREETYPE --cflags`"
-LIBFREETYPE_LIBS="`$FREETYPE --libs`"
+LIBFREETYPE_CFLAGS="`pkgconf --cflags freetype2`"
+LIBFREETYPE_LIBS="`pkgconf --libs freetype2`"
AC_SUBST(LIBFREETYPE_CFLAGS)
AC_SUBST(LIBFREETYPE_LIBS)
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