Fix build on EL7

libplacebo.spec

@@ -1,6 +1,6 @@
 Name:           libplacebo
 Version:        0.4.0
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        Reusable library for GPU-accelerated video/image rendering primitives
 
 License:        LGPLv2+
@@ -8,7 +8,16 @@ URL:            https://github.com/haasn/libplacebo
 Source0:        %{url}/archive/v%{version}/%{name}-%{version}.tar.gz
 
 BuildRequires:  meson
+# Use a more modern compiler toolchain on EL7
+%if 0%{?rhel} == 7
+BuildRequires:  devtoolset-7-toolchain, devtoolset-7-libatomic-devel
+# Vulkan is optional, but only available on theses arches for EL7
+%ifarch x86_64 ppc64le
 BuildRequires:  vulkan-devel
+%endif
+%else # Fedora
+BuildRequires:  vulkan-devel
+%endif
 
 
 %description
@@ -37,8 +46,17 @@ developing applications that use %{name}.
 %prep
 %autosetup -p1
 
+%if 0%{?rhel} == 7
+. /opt/rh/devtoolset-7/enable
+%endif
+
 
 %build
+
+%if 0%{?rhel} == 7
+. /opt/rh/devtoolset-7/enable
+%endif
+
 %meson
 %meson_build
 
@@ -62,5 +80,8 @@ developing applications that use %{name}.
 
 
 %changelog
+* Mon May 21 2018 Nicolas Chauvet <kwizart@gmail.com> - 0.4.0-2
+- Fix build on EL7
+
 * Mon Feb 12 2018 Nicolas Chauvet <kwizart@gmail.com> - 0.4.0-1
 - Initial spec file