diff --git a/src/shcode/ympbuild_header.sh b/src/shcode/ympbuild_header.sh
index 91cea3a..5e8dba9 100755
--- a/src/shcode/ympbuild_header.sh
+++ b/src/shcode/ympbuild_header.sh
@@ -4,6 +4,7 @@ declare -r installdir="@buildpath@/output"
 declare -r jobs="-j@jobs@"
 export HOME="@buildpath@"
 export USER="root"
+export PREFIX="/usr"
 export DESTDIR="$installdir"
 export INSTALL_ROOT="$installdir"
 declare -r YMPVER="@VERSION@"
diff --git a/src/util/build.vala b/src/util/build.vala
index 844f203..cfd3cac 100755
--- a/src/util/build.vala
+++ b/src/util/build.vala
@@ -231,9 +231,9 @@ public class builder {
         }
         if (need_install.length > 0) {
             if (get_bool("install")) {
-                if(install_main(need_install) ! = 0){
+                if(install_main(need_install) != 0){
                     error_add(_("Packages build canceled."));
-                };
+                }
             } else {
                 error_add(_("Packages is not installed: %s").printf(join(" ", need_install)));
             }