diff -urN a/lib/FusionInventory/Agent/Config.pm b/lib/FusionInventory/Agent/Config.pm
--- a/lib/FusionInventory/Agent/Config.pm	2020-05-27 11:09:31.969999393 -0000
+++ b/lib/FusionInventory/Agent/Config.pm	2020-05-27 11:09:39.833332729 -0000
@@ -67,7 +67,7 @@
     my ($class, %params) = @_;
 
     my $self = {
-        '_confdir' => undef, # SYSCONFDIR replaced here from Makefile
+        '_confdir' => '/etc/fusioninventory', # SYSCONFDIR replaced here from Makefile
     };
     bless $self, $class;
     $self->_loadDefaults();
diff -urN a/lib/setup.pm b/lib/setup.pm
--- a/lib/setup.pm	2020-05-27 11:09:31.989999393 -0000
+++ b/lib/setup.pm	2020-05-27 11:11:02.233332727 -0000
@@ -11,9 +11,9 @@
 our @EXPORT = ('%setup');
 
 our %setup = (
-    datadir => './share',
+    datadir => '/usr/share/fusioninventory',
     libdir  => './lib',
-    vardir  => './var',
+    vardir  => '/var/lib/fusioninventory',
 );
 
 # Compute directly libdir from this setup file as it should be installed
diff -urN a/Makefile.PL b/Makefile.PL
--- a/Makefile.PL	2020-05-27 11:09:31.966666059 -0000
+++ b/Makefile.PL	2020-05-27 11:09:39.833332729 -0000
@@ -170,18 +170,15 @@
         INSTALLSCRIPT        => '$(PREFIX)/bin',
         INSTALLSITESCRIPT    => '$(PREFIX)/bin',
         INSTALLVENDORSCRIPT  => '$(PREFIX)/bin',
-        INSTALLLIB           => '$(DATADIR)/lib',
-        INSTALLSITELIB       => '$(DATADIR)/lib',
-        INSTALLVENDORLIB     => '$(DATADIR)/lib',
         INSTALLMAN1DIR       => '$(PREFIX)/share/man/man1',
         INSTALLSITEMAN1DIR   => '$(PREFIX)/share/man/man1',
         INSTALLVENDORMAN1DIR => '$(PREFIX)/share/man/man1',
         INSTALLMAN3DIR       => '$(PREFIX)/share/man/man3',
         INSTALLSITEMAN3DIR   => '$(PREFIX)/share/man/man3',
         INSTALLVENDORMAN3DIR => '$(PREFIX)/share/man/man3',
-        SYSCONFDIR           => '$(PREFIX)/etc/fusioninventory',
+        SYSCONFDIR           => '/etc/fusioninventory',
         DATADIR              => '$(PREFIX)/share/fusioninventory',
-        LOCALSTATEDIR        => '$(PREFIX)/var/fusioninventory',
+        LOCALSTATEDIR        => '/var/lib/fusioninventory',
     );
 
     # allow variables defined on command line to override defaults