Only in libsolv-0.6.34.patched: build
diff -ru libsolv-0.6.34/ext/repo_pubkey.c libsolv-0.6.34.patched/ext/repo_pubkey.c
--- libsolv-0.6.34/ext/repo_pubkey.c	2018-05-17 00:43:25.000000000 +0200
+++ libsolv-0.6.34.patched/ext/repo_pubkey.c	2019-06-01 10:15:43.608634150 +0200
@@ -28,6 +28,7 @@
 #ifndef RPM5
 #include <rpm/header.h>
 #endif
+#include <rpm/rpm46compat.h>
 #include <rpm/rpmdb.h>
 
 #include "pool.h"
@@ -757,7 +758,7 @@
 #ifndef RPM5
   dig = pgpNewDig();
 #else
-  dig = pgpDigNew(RPMVSF_DEFAULT, 0);
+  dig = pgpDigNew(RPMVSF_DEFAULT);
 #endif
   (void) pgpPrtPkts(pkts, pktsl, dig, 0);
 #ifdef HAVE_PGPDIGGETPARAMS
@@ -782,7 +783,7 @@
 #ifndef RPM5
   (void)pgpFreeDig(dig);
 #else
-  (void)pgpDigFree(dig);
+  (void)pgpDigFree(dig, 0);
 #endif
 }