Fix building error, add gcc-g++ build requires

update cairomm.spec.

cairomm.spec

@@ -5,7 +5,7 @@
 
 Name:           cairomm
 Version:        1.12.0
-Release:        10
+Release:        11
 Summary:        C++ API for the cairo graphics library
 License:        LGPLv2+
 URL:            http://www.cairographics.org
@@ -13,7 +13,7 @@ Source:         http://www.cairographics.org/releases/%{name}-%{version}.tar.gz
 
 BuildRequires:  cairo-devel >= %{cairo_version}
 BuildRequires:  libsigc++20-devel >= %{libsigc_version}
-BuildRequires:  perl, perl(Getopt::Long), pkgconfig
+BuildRequires:  perl, perl(Getopt::Long), pkgconfig, gcc-g++
 
 Requires:       cairo%{?_isa} >= %{cairo_version}
 Requires:       libsigc++20%{?_isa} >= %{libsigc_version}
@@ -67,6 +67,9 @@ developing %{name} applications.
 %doc %{_datadir}/devhelp/
 
 %changelog
+* Mon May 31 2021 baizhonggui <baizhonggui@huawei.com> - 1.12.0-11
+- Fix building error: C++ compiler cannot create executables
+- Add gcc-g++ in BuildRequires
 
 * Sun Dec 1 2019  jiaxiya <jiaxiyajiaxiya@168.com> - 1.12.0-10
 - Package init