Change libcap.rb to make it work with gperf 3.1

packages/libcap.rb

@@ -7,7 +7,13 @@ class Libcap < Package
   source_url 'https://www.kernel.org/pub/linux/libs/security/linux-privs/libcap2/libcap-2.25.tar.xz'
   source_sha256 '693c8ac51e983ee678205571ef272439d83afe62dd8e424ea14ad9790bc35162'
 
+  depends_on 'gperf' => :build
+  depends_on 'perl' => :build
+
   def self.build
+    # add includes option to make it work with gperf-3.1
+    system 'sed -e "/gperf --/s/gperf --/gperf --includes --/" -e "/gperf --/s/cap_lookup_name(/cap_dummy(/" -i libcap/Makefile'
+
     # change the path to ld
     system 'sed -i "s,/usr/bin/ld,/usr/local/bin/ld,g" Make.Rules'
     # change prefix
@@ -16,12 +22,10 @@ class Libcap < Package
     system 'sed -i "s,^exec_prefix=,exec_prefix=\$(prefix)," Make.Rules'
     # http://git.yoctoproject.org/cgit.cgi/poky/plain/meta/recipes-support/libcap/files/0001-ensure-the-XATTR_NAME_CAPS-is-defined-when-it-is-use.patch
     system 'sed -i "s,^\#ifdef VFS_CAP_U32,\#if defined (VFS_CAP_U32) \&\& defined (XATTR_NAME_CAPS),g" libcap/cap_file.c'
-    # only root user can setcap
-    system 'sed -i "s,\$(FAKEROOT)\$(SBINDIR)/setcap,sudo \$(FAKEROOT)\$(SBINDIR)/setcap," progs/Makefile'
     system 'make'
   end
 
   def self.install
-    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+    system "make", "RAISE_SETFCAP=no", "DESTDIR=#{CREW_DEST_DIR}", "install"
   end
 end