diff --git a/debian.control b/debian.control
index a030192..050a8fa 100644
--- a/debian.control
+++ b/debian.control
@@ -9,6 +9,7 @@ Standards-Version: 4.5.1
 Package: mapi-header-php
 Architecture: any
 Depends: ${misc:Depends}, ${shlibs:Depends}, grommunio-error-pages
+Conflicts: gromox (< 2.3.20)
 Description: Common PHP MAPI header files for grommunio
  PHP files shared between grommunio-web, grommunio-sync and other PHP
  applications from the groupware suite.
diff --git a/debian.rules b/debian.rules
index f1869da..aeb3ba0 100644
--- a/debian.rules
+++ b/debian.rules
@@ -5,5 +5,4 @@ INSTDIR=debian/tmp
 	dh $@
 
 override_dh_auto_install:
-	mkdir -p "${INSTDIR}/usr/share/php-mapi/"
-	cp -av *.php "${INSTDIR}/usr/share/php-mapi/"
+	make install DESTDIR=${INSTDIR}