rpm: more reliable detection of CentOS 7.4.
diff --git a/rpm/SPECS/nginx-module.spec.in b/rpm/SPECS/nginx-module.spec.in
index 028b179..dfc4f86 100644
--- a/rpm/SPECS/nginx-module.spec.in
+++ b/rpm/SPECS/nginx-module.spec.in
@@ -13,10 +13,11 @@
%endif
%if 0%{?rhel} == 7
+BuildRequires: redhat-lsb-core
%define epoch 1
Epoch: %{epoch}
-%define openssl_version %(rpmquery openssl | cut -c 9-13)
-%if "%{openssl_version}" == "1.0.2"
+%define os_minor %(lsb_release -rs | cut -d '.' -f 2)
+%if %{os_minor} >= 4
%define dist .el7_4
%else
%define dist .el7
diff --git a/rpm/SPECS/nginx-plus-module.spec.in b/rpm/SPECS/nginx-plus-module.spec.in
index cbce094..2922019 100644
--- a/rpm/SPECS/nginx-plus-module.spec.in
+++ b/rpm/SPECS/nginx-plus-module.spec.in
@@ -13,8 +13,9 @@
%endif
%if 0%{?rhel} == 7
-%define openssl_version %(rpmquery openssl | cut -c 9-13)
-%if "%{openssl_version}" == "1.0.2"
+BuildRequires: redhat-lsb-core
+%define os_minor %(lsb_release -rs | cut -d '.' -f 2)
+%if %{os_minor} >= 4
%define dist .el7_4
%else
%define dist .el7
diff --git a/rpm/SPECS/nginx.spec.in b/rpm/SPECS/nginx.spec.in
index 422735e..b9d938b 100644
--- a/rpm/SPECS/nginx.spec.in
+++ b/rpm/SPECS/nginx.spec.in
@@ -26,14 +26,15 @@
%endif
%if 0%{?rhel} == 7
+BuildRequires: redhat-lsb-core
%define _group System Environment/Daemons
%define epoch 1
Epoch: %{epoch}
Requires(pre): shadow-utils
Requires: systemd
BuildRequires: systemd
-%define openssl_version %(rpmquery openssl | cut -c 9-13)
-%if "%{openssl_version}" == "1.0.2"
+%define os_minor %(lsb_release -rs | cut -d '.' -f 2)
+%if %{os_minor} >= 4
Requires: openssl >= 1.0.2
BuildRequires: openssl-devel >= 1.0.2
%define dist .el7_4
