opensp: Fix build on aarch64

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

opensp/opensp.nm

@@ -5,7 +5,7 @@
 
 name       = opensp
 version    = 1.5.2
-release    = 3
+release    = 4
 thisapp    = OpenSP-%{version}
 
 groups     = Application/Text
@@ -25,6 +25,7 @@ build
 		gcc-c++
 		docbook-dtds
 		docbook-xsl
+		libtool
 		libxml2
 		libxslt
 		perl
@@ -39,6 +40,10 @@ build
 		--enable-default-catalog=/etc/sgml/catalog \
 		--enable-default-search-path=/usr/share/sgml:/usr/share/xml
 
+	prepare_cmds
+		%{MACRO_FIX_AUTOTOOLS}
+	end
+
 	install_cmds
 		# Create symlinks and manpages for binaries wtitout "o".
 		for file in nsgmls sgmlnorm spam spent sx ; do