Change: Source1, Source2 -> Source0, Source1.

Change: make %{?_smp_mflags} -> %make_build
Change: make install DESTDIR=%{buildroot} -> %make_install.

cppad.spec

@@ -18,8 +18,8 @@ Summary: C++ Algorithmic Differentiation (AD), %{name}-devel and %{name}-doc
 
 License: EPL-2.0 or GPLv2+
 URL: http://coin-or.github.io/CppAD
-Source1: https://github.com/coin-or/CppAD/archive/%{version}.tar.gz
-Source2: https://github.com/coin-or/CppAD/archive/%{yyyymmdd}.doc.tar.gz
+Source0: https://github.com/coin-or/CppAD/archive/%{version}.tar.gz
+Source1: https://github.com/coin-or/CppAD/archive/%{yyyymmdd}.doc.tar.gz
 BuildRequires: gcc
 BuildRequires: gcc-c++
 BuildRequires: cmake >= 2.8
@@ -151,14 +151,17 @@ cppad_cxx_flags='-Wall -pedantic-errors -std=c++11 -Wshadow -Wconversion'
     -D cppad_debug_which='debug_all' \
     CppAD-%{version}
 #
-make %{?_smp_mflags}
+# see https://docs.fedoraproject.org/en-US/packaging-guidelines/
+#   parallel_make
+%make_build
 
 # -----------------------------------------------------------------------------
 # Install
 # -----------------------------------------------------------------------------
 %install
-rm -rf %{buildroot}
-make install DESTDIR=%{buildroot}
+# https://docs.fedoraproject.org/en-US/packaging-guidelines/
+#   why_the_makeinstall_macro_should_not_be_used
+%make_install
 
 %files devel
 %{_includedir}/%{name}
@@ -186,6 +189,9 @@ make %{?_smp_mflags} check
 * Sun Feb 28 2021 Brad Bell <bradbell at seanet dot com> - 20210000.5-1
 - Advance to upstream source 20210000.5
 - Remove patches that are no longer necessary.
+- Change: Source1, Source2 -> Source0, Source1.
+- Change: make %%{?_smp_mflags} -> %%make_build
+- Change: make install DESTDIR=%%{buildroot} -> %%make_install.
 
 * Thu Feb 18 2021 Brad Bell <bradbell at seanet dot com> - 20210000.3-3
 - Patch corresponding to bug fix in upstream source 20210000.5