diff --git a/100.perk.build b/100.perk.build
index 969f75d..cb6d805 100644
--- a/100.perk.build
+++ b/100.perk.build
@@ -9,7 +9,7 @@ fi;
 set_build_dir ${2} native;
 if ! is_build_script_done configure1; then
 	rm_if_exists -m -c ${PKG_BUILD_DIR};
-	../perk/configure;
+	../perk/configure --prefix=/usr;
 	set_build_script_done configure1 clean1 -build1;
 else
 	cd ${PKG_BUILD_DIR};
@@ -29,7 +29,7 @@ fi;
 set_build_dir ${2} cross;
 if ! is_build_script_done configure2; then
 	rm_if_exists -m -c ../${PKG_BUILD_DIR};
-	../perk/configure --target=${TARGET};
+	../perk/configure --prefix=/usr --target=${TARGET};
 	set_build_script_done configure2 clean2 -build2;
 else
 	cd ../${PKG_BUILD_DIR};
diff --git a/367.perl.vars b/367.perl.vars
index 5a1cce3..6858393 100644
--- a/367.perl.vars
+++ b/367.perl.vars
@@ -15,7 +15,10 @@ pkg_perl_extract_post() {
 		fi;
 		cp ${_ppep_fname_src} ${_ppep_fname_dst};
 	done;
-	unset _ppep_fname_src _ppep_fname_dst;
+	for _ppep_cflag in ${PKG_CFLAGS_CONFIGURE}; do
+		PKG_CONFIGURE_ARGS="${PKG_CONFIGURE_ARGS:+${PKG_CONFIGURE_ARGS} }-A ccflags=${_ppep_cflag}";
+	done;
+	unset _ppep_fname_src _ppep_fname_dst _ppep_cflag;
 };
 
 # vim:filetype=sh
diff --git a/build.usage b/build.usage
index c4d33da..5beef93 100644
--- a/build.usage
+++ b/build.usage
@@ -8,8 +8,8 @@ usage: ./build.sh [-c] [-nd] [-r ALL|name[:step]] [-h] [-t]
                                This currently only includes rm_if_exists().
         -r ALL|name[:step]     Restart all or the specified build script(s) completely
                                or at the optionally specified build step. Currently defined
-                               build steps are: fetch extract patch configure clean build
-                               install configure1 configure2 build1 build2 install1 install2.
+                               build steps are: fetch extract build_dir patch configure clean
+                               build install configure1 configure2 build1 build2 install1 install2.
         -t                     Produce a distribution tarball containing $PREFIX
                                sans $WORKDIR and $PREFIX/src/midipix_build at the end of a
                                build with zero failures.
diff --git a/build.vars b/build.vars
index 9ba26fa..e5deedd 100644
--- a/build.vars
+++ b/build.vars
@@ -275,6 +275,7 @@ export PATH="${PREFIX}/bin${PATH:+:${PATH}}";
 : ${PKG_PERL_SHA256SUM:=2b475d0849d54c4250e9cba4241b7b7291cffb45dfd083b677ca7b5d38118f27};
 : ${PKG_PERL_URL:=http://www.cpan.org/src/5.0/perl-${PKG_PERL_VERSION}.tar.gz};
 : ${PKG_PERL_CONFIGURE_ARGS:="-A ccflags=-I${PREFIX_LVL3}/include --sysroot=${PREFIX_LVL3} --target=x86_64-nt64-midipix"};
+: ${PKG_PERL_MAKEFLAGS_BUILD:=-j1};
 : ${PKG_RSYNC_VERSION:=3.1.2};
 : ${PKG_RSYNC_SHA256SUM:=ecfa62a7fa3c4c18b9eccd8c16eaddee4bd308a76ea50b5c02a5840f09c0a1c2};
 : ${PKG_RSYNC_URL:=https://download.samba.org/pub/rsync/src/rsync-${PKG_RSYNC_VERSION}.tar.gz};