Add distribution README file

libxcrypt.spec

@@ -46,6 +46,17 @@
 %endif
 
 
+# Needed for the distribution README file.
+%if 0%{?fedora}
+%global distname .fedora
+%else
+%if 0%{?rhel}
+%global distname .rhel
+%else
+%global distname .distribution
+%endif
+%endif
+
 # Needed for out-of-tree builds.
 %global _configure ../"configure"
 
@@ -204,6 +215,22 @@ discouraged.
 %prep
 %autosetup -p 1
 ./bootstrap
+%if %{with new_api}
+%{__cat} << EOF >> README%{distname}
+This version of the %{name} package ships the libcrypt.so2
+library and does not provide the legacy API functions that have
+been provided by glibc's libcrypt.so.1.  The removed functions
+by name are encrypt, encrypt_r, setkey, setkey_r, and fcrypt.
+
+If you are using a third-party application that links against
+those functions, or that is linked against glibc's libcrypt,
+you may need to install the %{name}-compat package manually.
+
+All existing binary executables linked against glibc's libcrypt
+should work unmodified with the libcrypt.so.1 library supplied
+by the %{name}-compat package.
+EOF
+%endif
 %{__mkdir_p} %{_vpath_builddir}{,-compat}
 
 
@@ -253,10 +280,10 @@ popd
 %{__install} -Dpm 0644 -t %{buildroot}%{_pkgdocdir} \
   ChangeLog NEWS README THANKS TODO
 
-# Install 'README.fedora', if existing, to shared %%_pkgdocdir.
+# Install distribution README file, if existing, to shared %%_pkgdocdir.
-if [ -f README.fedora ]; then
+if [ -f README%{distname} ]; then
   %{__install} -Dpm 0644 -t %{buildroot}%{_pkgdocdir} \
-    README.fedora
+    README%{distname}
 fi
 
 
@@ -331,6 +358,7 @@ done
 %changelog
 * Mon Jan 14 2019 Björn Esser <besser82@fedoraproject.org> - 4.4.2-4
 - Bump SO-name for Fedora >= 30 and enable compat package (#1666033)
+- Add distribution README file
 
 * Sun Dec 23 2018 Björn Esser <besser82@fedoraproject.org> - 4.4.2-3
 - Remove architecture bits from Recommends