fix build fail

qpdf.spec

@@ -1,5 +1,5 @@
 Name:           qpdf
-Version:        8.2.1
+Version:        8.4.2
 Release:        2
 Summary:        A command-line program to transform PDF files
 License:        (Artistic 2.0 or ASL 2.0) and MIT
@@ -24,6 +24,7 @@ on PDF files. It could have been called something like pdf-to-pdf. It also provi
 useful capabilities to developers of PDF-producing software or for people who just want
 to look at the innards of a PDF file to learn more about how they work.
 
+
 %package devel
 Summary:        Development package for %{name}
 Requires:       %{name} = %{version}-%{release}
@@ -47,6 +48,7 @@ sed -i '1c#!/usr/bin/perl' qpdf/fix-qdf
 
 %build
 autoreconf --verbose --force --install
+./autogen.sh
 
 %configure --disable-static --enable-show-failed-test-output
 
@@ -60,9 +62,9 @@ autoreconf --verbose --force --install
 %check
 make check
 
-%post -p /usr/sbin/ldconfig
+%post -p /sbin/ldconfig
 
-%postun -p /usr/sbin/ldconfig
+%postun -p /sbin/ldconfig
 
 %files
 %doc README.md TODO ChangeLog
@@ -81,5 +83,5 @@ make check
 %{_mandir}/man1/*
 
 %changelog
-* Wed Dec 11 2019 catastrowings <jianghuhao1994@163.com> - 8.2.1-2
+* Wed Dec 11 2019 catastrowings <jianghuhao1994@163.com> - 8.4.2-2
 - openEuler init