generate manpages from .xml file in srcdir not builddir

The .xml file is not a generated file.

src/bin/admin/Makefile.am

@@ -10,7 +10,7 @@ EXTRA_DIST = $(man_MANS) kea-admin.xml admin-utils.sh
 if GENERATE_DOCS
 
 kea-admin.8: kea-admin.xml
-	@XSLTPROC@ --novalid --xinclude --nonet -o $@ http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl $(builddir)/kea-admin.xml
+	@XSLTPROC@ --novalid --xinclude --nonet -o $@ http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl $(srcdir)/kea-admin.xml
 
 else
 

src/bin/keactrl/Makefile.am

@@ -19,7 +19,7 @@ BUILT_SOURCES = kea.conf
 if GENERATE_DOCS
 
 keactrl.8: keactrl.xml
-	@XSLTPROC@ --novalid --xinclude --nonet -o $@ http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl $(builddir)/keactrl.xml
+	@XSLTPROC@ --novalid --xinclude --nonet -o $@ http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl $(srcdir)/keactrl.xml
 
 else
 

src/bin/perfdhcp/Makefile.am

@@ -59,7 +59,7 @@ EXTRA_DIST += $(man_MANS) perfdhcp.xml
 if GENERATE_DOCS
 
 perfdhcp.8: perfdhcp.xml
-	@XSLTPROC@ --novalid --xinclude --nonet -o $@ http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl $(builddir)/perfdhcp.xml
+	@XSLTPROC@ --novalid --xinclude --nonet -o $@ http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl $(srcdir)/perfdhcp.xml
 
 else