Upstream: No
Reason: Fixes compilation with musl

--- a/configure.ac
+++ b/configure.ac
@@ -229,6 +229,7 @@ AC_SEARCH_LIBS(dlopen, [dl])
 # Check for libelf library. Prefer external, otherwise none.
 WITH_LIBELF_LIB=
 AC_CHECK_HEADER([libelf.h])
+AC_CHECK_HEADERS([error.h], [WITH_ERROR_H=yes])
 AC_CHECK_HEADERS([gelf.h], [
 	AC_CHECK_LIB(elf, gelf_getvernaux, [
 	    AC_DEFINE(HAVE_LIBELF, 1, [Define to 1 if you have the 'elf' library (-lelf).])
@@ -237,7 +238,7 @@ AC_CHECK_HEADERS([gelf.h], [
 	])
 ])
 AC_SUBST(WITH_LIBELF_LIB)
-AM_CONDITIONAL(LIBELF,[test "$WITH_LIBELF" = yes])
+AM_CONDITIONAL(LIBELF,[test "$WITH_LIBELF" = yes && test "$WITH_ERROR_H" = yes])
 
 AC_CHECK_HEADERS([dwarf.h], [
   WITH_LIBDWARF=yes
--- a/rpmio/digest_nss.c
+++ b/rpmio/digest_nss.c
@@ -6,6 +6,7 @@
 #include <keyhi.h>
 #include <cryptohi.h>
 #include <blapit.h>
+#include <signal.h>
 
 #include <rpm/rpmlog.h>
 #include "rpmio/digest.h"