subversion: fix Perl install location

subversion --perl tries to install to `/Library/Perl` which is
not writeable by the regular user and causes a build error.

- Set the perl `DESTDIR=#{prefix}` and add a caveat.

Fixes #15352

Closes #15652.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/Library/Formula/subversion.rb b/Library/Formula/subversion.rb
index ffb133a9c..57f9bb696 100644
--- a/Library/Formula/subversion.rb
+++ b/Library/Formula/subversion.rb
@@ -181,7 +181,7 @@ class Subversion < Formula
           "$(SWIG_INCLUDES) #{arches} -g -pipe -fno-common -DPERL_DARWIN -fno-strict-aliasing -I/usr/local/include -I#{perl_core}"
       end
       system "make swig-pl"
-      system "make install-swig-pl"
+      system "make", "install-swig-pl", "DESTDIR=#{prefix}"
     end
 
     if build_java?
@@ -208,6 +208,14 @@ class Subversion < Formula
       EOS
     end
 
+    if build_perl?
+      s += <<-EOS.undent
+        The perl bindings are located in various subdirectories of:
+          #{prefix}/Library/Perl
+
+      EOS
+    end
+
     if build_ruby?
       s += <<-EOS.undent
         You may need to add the Ruby bindings to your RUBYLIB from: