Add workaround for build error with flex-2.6.0

kf5-solid.spec

@@ -17,6 +17,10 @@ URL:            https://quickgit.kde.org/?p=%{framework}.git
 %endif
 Source0:        http://download.kde.org/%{stable}/frameworks/%{versiondir}/%{framework}-%{version}.tar.xz
 
+# Workaround https://bugzilla.redhat.com/show_bug.cgi?id=1364943
+# Technically only affects rawhide/f26, but is harmless elsewhere too
+Patch0:         solid-5.25-fix-build-with-flex-2.6.0.patch
+
 BuildRequires:  extra-cmake-modules >= %{version}
 BuildRequires:  kf5-rpm-macros >= %{version}
 BuildRequires:  libupnp-devel
@@ -73,7 +77,6 @@ developing applications that use %{name}.
 %prep
 %autosetup -n %{framework}-%{version}
 
-
 %build
 mkdir %{_target_platform}
 pushd %{_target_platform}
@@ -82,7 +85,6 @@ popd
 
 make %{?_smp_mflags} -C %{_target_platform}
 
-
 %install
 make install/fast DESTDIR=%{buildroot} -C %{_target_platform}
 

solid-5.25-fix-build-with-flex-2.6.0.patch

@@ -0,0 +1,16 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 8a394d1..d88e824 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -45,6 +45,11 @@ set_package_properties(BISON PROPERTIES
+     PURPOSE "Required for the Predicate parser"
+ )
+ 
++# flex-2.6.0 generates C90-incompatible code. KDEFrameworksCompilerSettings
++# forces C90 standard though, overriding our CFLAGS env variable, so we must
++# override the -std flag here
++set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99")
++
+ if (CMAKE_SYSTEM_NAME MATCHES Linux)
+     find_package( UDev )
+