diff --git a/kmplot.spec b/kmplot.spec
index 9d8e5ef..4999018 100644
--- a/kmplot.spec
+++ b/kmplot.spec
@@ -43,21 +43,26 @@ BuildRequires:  pkgconfig(Qt5Svg)
 BuildRequires:  pkgconfig(Qt5Widgets)
 Obsoletes:      %{name}5 < %{version}
 Provides:       %{name}5 = %{version}
-%if %{with lang}
 Recommends:     %{name}-lang
+%if 0%{?suse_version} < 1500
+# the default gcc 4.8 is too old
+BuildRequires:  gcc7-c++
 %endif
 
 %description
 Mathematical function plotter by KDE.
 
-%if %{with lang}
 %lang_package
-%endif
 
 %prep
 %setup -q
 
 %build
+%if 0%{?suse_version} < 1500
+# the default gcc 4.8 is too old
+export CC=gcc-7
+export CXX=g++-7
+%endif
 %ifarch ppc ppc64
 export RPM_OPT_FLAGS="%{optflags} -mminimal-toc"
 %endif