diff --git a/basis/formatting/formatting-tests.factor b/basis/formatting/formatting-tests.factor
index 79f386ff3d..478a84dc16 100644
--- a/basis/formatting/formatting-tests.factor
+++ b/basis/formatting/formatting-tests.factor
@@ -143,6 +143,7 @@ IN: formatting.tests
 { "[####monkey]" } [ "monkey" "[%'#10s]" sprintf ] unit-test
 { "[many monke]" } [ "many monkeys" "[%10.10s]" sprintf ] unit-test
 
+{ "{ 1, 2, 3 }" } [ BV{ 1 2 3 } "%[%d, %]" sprintf ] unit-test
 { "{ 1, 2, 3 }" } [ { 1 2 3 } "%[%s, %]" sprintf ] unit-test
 { "{ 1:2, 3:4 }" } [ H{ { 1 2 } { 3 4 } } "%[%s: %s %]" sprintf ] unit-test
 
diff --git a/basis/formatting/formatting.factor b/basis/formatting/formatting.factor
index 697616280b..c45f3fa238 100644
--- a/basis/formatting/formatting.factor
+++ b/basis/formatting/formatting.factor
@@ -136,9 +136,9 @@ numbers   = sign pad numbers_    => [[ unclip-last prefix compose-all [ fix-sign
 
 types     = strings|numbers
 
-lists     = "[%" types ", %]"    => [[ second '[ _ map ", " join "{ " prepend " }" append ] ]]
+lists     = "[%" types ", %]"    => [[ second '[ _ { } map-as ", " join "{ " " }" surround ] ]]
 
-assocs    = "[%" types ": %" types " %]" => [[ [ second ] [ fourth ] bi '[ unzip [ _ map ] dip _ map zip [ ":" join ] map ", " join "{ " prepend " }" append ] ]]
+assocs    = "[%" types ": %" types " %]" => [[ [ second ] [ fourth ] bi '[ [ _ _ bi* ":" glue ] { } assoc>map ", " join "{ " " }" surround ] ]]
 
 formats   = "%" (types|fmt-%|lists|assocs|unknown) => [[ second ]]
 
diff --git a/basis/unix/process/process.factor b/basis/unix/process/process.factor
index b33b824a73..de63b8449c 100644
--- a/basis/unix/process/process.factor
+++ b/basis/unix/process/process.factor
@@ -1,5 +1,6 @@
-USING: alien.c-types alien.data alien.syntax io.encodings.utf8
-kernel libc math sequences unix unix.types unix.utilities ;
+USING: alien.c-types alien.data alien.syntax classes.struct
+generalizations io.encodings.utf8 kernel libc math sequences
+unix unix.types unix.utilities ;
 IN: unix.process
 
 ! Low-level Unix process launching utilities. These are used
@@ -14,6 +15,30 @@ FUNCTION: int execv ( c-string path, c-string* argv )
 FUNCTION: int execvp ( c-string path, c-string* argv )
 FUNCTION: int execve ( c-string path, c-string* argv, c-string* envp )
 
+
+TYPEDEF: void posix_spawn_file_actions_t
+TYPEDEF: void posix_spawnattr_t
+
+FUNCTION: int posix_spawn ( pid_t *pid, c-string path,
+                       posix_spawn_file_actions_t *file_actions,
+                       posix_spawnattr_t *attrp,
+                       c-string* argv, c-string* envp )
+
+FUNCTION: int posix_spawnp ( pid_t *pid, c-string file,
+                       posix_spawn_file_actions_t *file_actions,
+                       posix_spawnattr_t *attrp,
+                       c-string* argv, c-string* envp )
+
+: posix-spawn ( path posix_spawn_file_actions_t* posix_spawnattr_t* argv envp -- pid_t )
+    [ [ 0 pid_t <ref> ] dip utf8 malloc-string ] 4dip
+    [ utf8 strings>alien ] bi@
+    [
+        posix_spawnp dup 0 = [ drop ] [ throw-errno ] if
+    ] 6 nkeep 5drop pid_t deref ;
+
+: posix-spawn-args-with-path ( seq -- int )
+    [ first f f ] keep f posix-spawn ;
+
 : exec ( pathname argv -- int )
     [ utf8 malloc-string ] [ utf8 strings>alien ] bi* execv ;
 
diff --git a/basis/unix/types/linux/linux.factor b/basis/unix/types/linux/linux.factor
index 9380e50d84..c5de4c2c92 100644
--- a/basis/unix/types/linux/linux.factor
+++ b/basis/unix/types/linux/linux.factor
@@ -6,6 +6,8 @@ TYPEDEF: ulong     __ulongword_type
 TYPEDEF: long      __sword_type
 TYPEDEF: ulong     __uword_type
 TYPEDEF: long      __slongword_type
+TYPEDEF: uint      __u32
+TYPEDEF: ulonglong __u64
 TYPEDEF: uint      __u32_type
 TYPEDEF: int       __s32_type
 
@@ -22,6 +24,7 @@ TYPEDEF: __slongword_type blksize_t
 TYPEDEF: __slongword_type blkcnt_t
 TYPEDEF: __sword_type     ssize_t
 TYPEDEF: __s32_type       pid_t
+TYPEDEF: ulong sigset_t
 TYPEDEF: __slongword_type time_t
 TYPEDEF: __slongword_type __time_t
 
diff --git a/build.sh b/build.sh
index 2c59230754..5414b06825 100755
--- a/build.sh
+++ b/build.sh
@@ -498,7 +498,7 @@ git_fetch() {
     branch=$(current_git_branch)
 
     rm -f "$(update_script_name)"
-	$ECHO git fetch "$GIT_URL" "$branch"
+    $ECHO git fetch "$GIT_URL" "$branch"
     invoke_git fetch "$GIT_URL" "$branch"
 
     if update_script_changed; then