Use make macros

https://fedoraproject.org/wiki/Changes/UseMakeBuildInstallMacro

flex.spec

@@ -3,7 +3,7 @@
 Summary: A tool for creating scanners (text pattern recognizers)
 Name: flex
 Version: 2.6.4
-Release: 4%{?dist}
+Release: 5%{?dist}
 # parse.c and parse.h are under GPLv3+ with exception which allows
 #	relicensing.  Since flex is shipped under BDS-style license,
 #	let's  assume that the relicensing was done.
@@ -59,11 +59,11 @@ plain text and PDF formats.
 %build
 autoreconf -i
 %configure --docdir=%{_pkgdocdir} CFLAGS="-fPIC $RPM_OPT_FLAGS"
-make %{?_smp_mflags}
+%make_build
 
 %install
 rm -rf $RPM_BUILD_ROOT
-make DESTDIR=$RPM_BUILD_ROOT install
+%make_install
 rm -f $RPM_BUILD_ROOT/%{_infodir}/dir
 rm -f $RPM_BUILD_ROOT/%{_pkgdocdir}/{README.cvs,TODO}
 # For now, excluding the new .la and .so files as we haven't had
@@ -110,6 +110,10 @@ echo ============END TESTING===========
 %{_pkgdocdir}
 
 %changelog
+* Mon Jul 13 2020 Tom Stellard <tstellar@redhat.com> - 2.6.4-5
+- Use make macros
+- https://fedoraproject.org/wiki/Changes/UseMakeBuildInstallMacro
+
 * Tue Jan 28 2020 Fedora Release Engineering <releng@fedoraproject.org> - 2.6.4-4
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_32_Mass_Rebuild