Index: src/build-data/os/openbsd.txt
--- src/build-data/os/openbsd.txt.orig
+++ src/build-data/os/openbsd.txt
@@ -1,7 +1,7 @@
 
 soname_pattern_base  "lib{libname}.so"
-soname_pattern_abi   "lib{libname}.so.{abi_rev}.{version_minor}"
-soname_pattern_patch "lib{libname}.so.{abi_rev}.{version_minor}"
+soname_pattern_abi   "lib{libname}.so.${LIBbotan-2_VERSION}"
+soname_pattern_patch "lib{libname}.so.${LIBbotan-2_VERSION}"
 
 shared_lib_symlinks no