fix el7 and el9 build errors in RPM SPEC file

rpmsrc/dtranslatebot.spec

@@ -1,5 +1,10 @@
 %global         _lto_cflags %{?_lto_cflags} -ffat-lto-objects
-%global         dtb_cmake_args -DCMAKE_BUILD_TYPE=Release -DWITH_DPP_STATIC_BUNDLE=TRUE -DWITH_SYSTEMD=TRUE
+
+%if 0%{?rhel} && 0%{?rhel} < 8
+%global         cmake %{?cmake3}
+%global         cmake_build %{?cmake3_build}
+%global         cmake_install %{?cmake3_install}
+%endif
 
 Name:           dtranslatebot
 Version:        0.2.0
@@ -7,21 +12,30 @@ Release:        1%{?dist}
 Summary:        Discord Translation Bot
 License:        BSD-2-Clause
 URL:            https://github.com/Syping/%{name}
-Source0:        %{name}_%{version}.tar.gz
+Source0:        %{name}-%{version}.tar.gz
 Source1:        %{name}.json
 Source2:        %{name}.service
 Source3:        %{name}.sysusersd
 
-BuildRequires:  cmake >= 3.16
+BuildRequires:  make
 BuildRequires:  perl
-%if 0%{?rhel} && 0%{?rhel} < 9
+BuildRequires:  perl-IPC-Cmd
+%if 0%{?rhel} && 0%{?rhel} < 8
+BuildRequires:  cmake3 >= 3.16
+BuildRequires:  devtoolset-9-annobin
+BuildRequires:  devtoolset-9-gcc-c++
+%else
+%if 0%{?rhel} && 0%{?rhel} == 8
+BuildRequires:  cmake >= 3.16
 BuildRequires:  gcc-toolset-9-annobin
 BuildRequires:  gcc-toolset-9-gcc-c++
 %else
+BuildRequires:  cmake >= 3.16
 BuildRequires:  annobin
 BuildRequires:  gcc-c++
 %endif
-%if 0%{?rhel}
+%endif
+%if 0%{?rhel} && 0%{?rhel} < 9
 BuildRequires:  epel-rpm-macros-systemd
 %endif
 BuildRequires:  systemd-rpm-macros
@@ -35,22 +49,22 @@ dtranslatebot is a Discord Bot which translate incoming Discord messages to Disc
 %setup -q
 
 %build
-%if 0%{?rhel} && 0%{?rhel} < 9
+%if 0%{?rhel} && 0%{?rhel} < 8
+source /opt/rh/devtoolset-9/enable
+%else
+%if 0%{?rhel} && 0%{?rhel} == 8
 source /opt/rh/gcc-toolset-9/enable
 %endif
-%cmake %{?dtb_cmake_args}
-%if 0%{?cmake_build:1}
-%cmake_build
-%else
-%make_build
 %endif
+%cmake \
+  -DCMAKE_BUILD_TYPE=Release \
+  -DPERL_EXECUTABLE=%{_bindir}/perl \
+  -DWITH_DPP_STATIC_BUNDLE=TRUE \
+  -DWITH_SYSTEMD=TRUE
+%cmake_build
 
 %install
-%if 0%{?cmake_install:1}
 %cmake_install
-%else
-%make_install
-%endif
 mkdir -p %{buildroot}%{_localstatedir}/lib/%{name}
 install -p -D -m 0644 %{SOURCE1} %{buildroot}%{_sysconfdir}/%{name}.json
 install -p -D -m 0644 %{SOURCE2} %{buildroot}%{_unitdir}/%{name}.service