Require devtoolset-8-toolchain on EPEL 7 for C++17 support

libopenmpt.spec

@@ -27,6 +27,10 @@ BuildRequires: pulseaudio-libs-devel
 #BuildRequires: SDL-devel
 #BuildRequires: SDL2-devel
 
+%if 0%{?rhel} && 0%{?rhel} < 8
+BuildRequires: devtoolset-8-toolchain
+%endif
+
 %description
 libopenmpt is a cross-platform C++ and C library to decode tracked music
 files (modules) into a raw PCM audio stream.
@@ -61,6 +65,10 @@ sed -i 's/\r$//' LICENSE
 
 
 %build
+%if 0%{?rhel} && 0%{?rhel} < 8
+. /opt/rh/devtoolset-8/enable
+%endif
+
 %configure  \
   --disable-static  \
   --without-sdl --without-sdl2 \