!16 Add the compilation dependency of gcc.

From: @lijingyuan007
Reviewed-by: @zengwefeng
Signed-off-by: @zengwefeng

unbound.spec

@@ -2,7 +2,7 @@
 
 Name:          unbound
 Version:       1.10.1
-Release:       3
+Release:       4
 Summary:       Unbound is a validating, recursive, caching DNS resolver
 License:       BSD
 Url:           https://nlnetlabs.nl/projects/unbound/about/
@@ -27,6 +27,7 @@ Patch1:        CVE-2020-28935.patch
 BuildRequires: make flex swig pkgconfig systemd
 BuildRequires: libevent-devel expat-devel openssl-devel python3-devel
 BuildRequires: unbound-libs
+BuildRequires: gcc
 
 %{?systemd_requires}
 Requires:      %{name}-libs = %{version}-%{release}
@@ -231,6 +232,12 @@ popd
 %{_mandir}/man*
 
 %changelog
+* Thu May 27 2021 lijingyuan <lijingyuan3@huawei.com> - 1.10.1-4
+- Type:bufix
+- ID:NA
+- SUG:NA
+- DESC:Add the compilation dependency of gcc.
+
 * Tue Feb 23 2021 zhouyihang <zhouyihang3@huawei.com> - 1.10.1-3
 - Type:CVE
 - ID:NA