diff --git a/build-libssl.sh b/build-libssl.sh
index 803f155..e4cba5e 100755
--- a/build-libssl.sh
+++ b/build-libssl.sh
@@ -536,7 +536,9 @@ if [ ${#OPENSSLCONF_ALL[@]} -gt 1 ]; then
     echo "# include <openssl/${OPENSSLCONF_CURRENT}>" >> "${OPENSSLCONF_INTERMEDIATE}"
   done
 
-  # Finish with #endif
+  # Finish
+  echo "#else" >> "${OPENSSLCONF_INTERMEDIATE}"
+  echo '# error Unable to determine target or target not included in OpenSSL build' >> "${OPENSSLCONF_INTERMEDIATE}"
   echo "#endif" >> "${OPENSSLCONF_INTERMEDIATE}"
 fi
 
diff --git a/include/opensslconf-template.h b/include/opensslconf-template.h
index fa24c60..6aa1060 100644
--- a/include/opensslconf-template.h
+++ b/include/opensslconf-template.h
@@ -6,3 +6,5 @@
  * See also https://github.com/x2on/OpenSSL-for-iPhone/issues/126 and referenced pull requests
  */
 
+#include <TargetConditionals.h>
+