diff --git a/basis/game/input/input-tests.factor b/basis/game/input/input-tests.factor
index 8cd3daa1d7..22c0b20dda 100644
--- a/basis/game/input/input-tests.factor
+++ b/basis/game/input/input-tests.factor
@@ -2,7 +2,9 @@ USING: ui game.input tools.test kernel system threads calendar
 combinators.short-circuit ;
 IN: game.input.tests
 
-os { [ windows? ] [ macosx? ] } 1|| [
+! os { [ windows? ] [ macosx? ] } 1|| [
+! This test only works if a mouse is present. Issue #1844
+os { [ macosx? ] } 1|| [
     [ ] [ open-game-input ] unit-test
     [ ] [ 1 seconds sleep ] unit-test
     [ ] [ close-game-input ] unit-test
diff --git a/basis/windows/dragdrop-listener/dragdrop-listener-docs.factor b/basis/windows/dragdrop-listener/dragdrop-listener-docs.factor
index 109f2f0b25..7aab4f7602 100644
--- a/basis/windows/dragdrop-listener/dragdrop-listener-docs.factor
+++ b/basis/windows/dragdrop-listener/dragdrop-listener-docs.factor
@@ -11,54 +11,6 @@ ARTICLE: "windows.dragdrop-listener" "Dropping files onto listener window"
 { $subsections dragdrop-listener-window }
 "Only one file at a time can be dropped." ;
 
-HELP: +listener-dragdrop-wrapper+
-{ $var-description "" } ;
-
-HELP: <listener-dragdrop>
-{ $values
-    { "hWnd" null }
-    { "object" object }
-}
-{ $description "" } ;
-
 HELP: dragdrop-listener-window
 { $description "Run this word from a listener to activate drag-and-drop support for the listener window." $nl
 "Note: if you get the \"" { $snippet "COM error 0x8007000e" } "\", you need to call " { $link ole-initialize } " first." } ;
-
-HELP: filecount-from-data-object
-{ $values
-    { "data-object" null }
-    { "n" null }
-}
-{ $description "" } ;
-
-HELP: filecount-from-hdrop
-{ $values
-    { "hdrop" null }
-    { "n" null }
-}
-{ $description "" } ;
-
-HELP: filenames-from-data-object
-{ $values
-    { "data-object" null }
-    { "filenames" null }
-}
-{ $description "" } ;
-
-HELP: filenames-from-hdrop
-{ $values
-    { "hdrop" null }
-    { "filenames" null }
-}
-{ $description "" } ;
-
-HELP: handle-data-object
-{ $values
-    { "handler" null } { "data-object" null }
-    { "filenames" null }
-}
-{ $description "" } ;
-
-HELP: listener-dragdrop
-{ $class-description "" } ;
diff --git a/basis/windows/dragdrop-listener/dragdrop-listener.factor b/basis/windows/dragdrop-listener/dragdrop-listener.factor
index 5aa2073b91..6a7d03d494 100644
--- a/basis/windows/dragdrop-listener/dragdrop-listener.factor
+++ b/basis/windows/dragdrop-listener/dragdrop-listener.factor
@@ -47,10 +47,11 @@ TUPLE: listener-dragdrop hWnd last-drop-effect ;
 : <listener-dragdrop> ( hWnd -- object )
     DROPEFFECT_NONE listener-dragdrop boa ;
 
+<<
 SYMBOL: +listener-dragdrop-wrapper+
+>>
 
 <<
-
 {
     { IDropTarget {
         [ ! HRESULT DragEnter ( IDataObject* pDataObject, DWORD grfKeyState, POINTL pt, DWORD* pdwEffect )
@@ -80,7 +81,6 @@ SYMBOL: +listener-dragdrop-wrapper+
         ]
     } }
 } <com-wrapper> +listener-dragdrop-wrapper+ set-global
-
 >>
 
 : dragdrop-listener-window ( -- )
diff --git a/build.sh b/build.sh
index c05081c37f..b4334cbf19 100755
--- a/build.sh
+++ b/build.sh
@@ -120,50 +120,50 @@ semver_into() {
         export "$4=${BASH_REMATCH[3]}"
         export "$5=${BASH_REMATCH[4]}"
     elif [[ $1 =~ $CLANG_RE_OLD ]] ; then
-	export "$2=${BASH_REMATCH[1]}"
-	export "$3=${BASH_REMATCH[2]}"
-	export "$4=0"
-	export "$5=${BASH_REMATCH[3]}"
+        export "$2=${BASH_REMATCH[1]}"
+        export "$3=${BASH_REMATCH[2]}"
+        export "$4=0"
+        export "$5=${BASH_REMATCH[3]}"
     else
-	echo "unsupported version number, please report a bug: $1"
-	exit 123
+        echo "unsupported version number, please report a bug: $1"
+        exit 123
     fi
 }
 
 # issue 1440
 gcc_version_ok() {
-	GCC_VERSION=`gcc -dumpversion`
-	local GCC_MAJOR local GCC_MINOR local GCC_PATCH local GCC_SPECIAL
-	semver_into $GCC_VERSION GCC_MAJOR GCC_MINOR GCC_PATCH GCC_SPECIAL
+    GCC_VERSION=`gcc -dumpversion`
+    local GCC_MAJOR local GCC_MINOR local GCC_PATCH local GCC_SPECIAL
+    semver_into $GCC_VERSION GCC_MAJOR GCC_MINOR GCC_PATCH GCC_SPECIAL
 
-	if [[ $GCC_MAJOR -lt 4
-		|| ( $GCC_MAJOR -eq 4 && $GCC_MINOR -lt 7 )
-		|| ( $GCC_MAJOR -eq 4 && $GCC_MINOR -eq 7 && $GCC_PATCH -lt 3 )
-		|| ( $GCC_MAJOR -eq 4 && $GCC_MINOR -eq 8 && $GCC_PATCH -eq 0 )
-		]] ; then
-		echo "gcc version required >= 4.7.3, != 4.8.0, >= 4.8.1, got $GCC_VERSION"
-		return 1
-	fi
-	return 0
+    if [[ $GCC_MAJOR -lt 4
+        || ( $GCC_MAJOR -eq 4 && $GCC_MINOR -lt 7 )
+        || ( $GCC_MAJOR -eq 4 && $GCC_MINOR -eq 7 && $GCC_PATCH -lt 3 )
+        || ( $GCC_MAJOR -eq 4 && $GCC_MINOR -eq 8 && $GCC_PATCH -eq 0 )
+        ]] ; then
+        echo "gcc version required >= 4.7.3, != 4.8.0, >= 4.8.1, got $GCC_VERSION"
+        return 1
+    fi
+    return 0
 }
 
 clang_version_ok() {
-	CLANG_VERSION=`clang --version | head -n1`
-	CLANG_VERSION_RE='^[a-zA-Z0-9 ]* version (.*)$' # 3.3-5
-	if [[ $CLANG_VERSION =~ $CLANG_VERSION_RE ]] ; then
-		export "CLANG_VERSION=${BASH_REMATCH[1]}"
-		local CLANG_MAJOR local CLANG_MINOR local CLANG_PATCH local CLANG_SPECIAL
-		semver_into "$CLANG_VERSION" CLANG_MAJOR CLANG_MINOR CLANG_PATCH CLANG_SPECIAL
-		if [[ $CLANG_MAJOR -lt 3
-			|| ( $CLANG_MAJOR -eq 3 && $CLANG_MINOR -le 1 )
-			]] ; then
-			echo "clang version required >= 3.1, got $CLANG_VERSION"
-			return 1
-		fi
-	else
-		return 1
-	fi
-	return 0
+    CLANG_VERSION=`clang --version | head -n1`
+    CLANG_VERSION_RE='^[a-zA-Z0-9 ]* version (.*)$' # 3.3-5
+    if [[ $CLANG_VERSION =~ $CLANG_VERSION_RE ]] ; then
+        export "CLANG_VERSION=${BASH_REMATCH[1]}"
+        local CLANG_MAJOR local CLANG_MINOR local CLANG_PATCH local CLANG_SPECIAL
+        semver_into "$CLANG_VERSION" CLANG_MAJOR CLANG_MINOR CLANG_PATCH CLANG_SPECIAL
+        if [[ $CLANG_MAJOR -lt 3
+            || ( $CLANG_MAJOR -eq 3 && $CLANG_MINOR -le 1 )
+            ]] ; then
+            echo "clang version required >= 3.1, got $CLANG_VERSION"
+            return 1
+        fi
+    else
+        return 1
+    fi
+    return 0
 }
 
 set_cc() {
@@ -189,14 +189,6 @@ set_make() {
     MAKE='make'
 }
 
-check_git_branch() {
-    BRANCH=`git symbolic-ref HEAD | sed -e 's,.*/\(.*\),\1,'`
-    if [ "$BRANCH" != "master" ] ; then
-        $ECHO "git branch is $BRANCH, not master"
-        exit_script 3
-    fi
-}
-
 check_installed_programs() {
     ensure_program_installed chmod
     ensure_program_installed uname
@@ -295,6 +287,17 @@ find_architecture() {
     esac
 }
 
+find_num_cores() {
+    $ECHO "Finding num cores..."
+    NUM_CORES=7ZZ
+    uname_s=`uname -s`
+    check_ret uname
+    case $uname_s in
+        CYGWIN_NT-5.2-WOW64 | *CYGWIN_NT* | *CYGWIN* | MINGW32*) NUM_CORES=$NUMBER_OF_PROCESSORS;;
+        *darwin* | *Darwin* | *linux* | *Linux*) NUM_CORES=$(getconf _NPROCESSORS_ONLN);;
+    esac
+}
+
 write_test_program() {
     #! Must be 'echo'
     echo "#include <stdio.h>" > $C_WORD.c
@@ -356,6 +359,7 @@ set_factor_image() {
 echo_build_info() {
     $ECHO OS=$OS
     $ECHO ARCH=$ARCH
+    $ECHO NUM_CORES=$NUM_CORES
     $ECHO WORD=$WORD
     $ECHO DEBUG=$DEBUG
     $ECHO FACTOR_BINARY=$FACTOR_BINARY
@@ -429,6 +433,7 @@ parse_build_info() {
 find_build_info() {
     find_os
     find_architecture
+    find_num_cores
     set_cc
     find_word_size
     set_factor_binary
@@ -536,7 +541,8 @@ make_clean() {
 }
 
 make_factor() {
-    invoke_make CC=$CC CXX=$CXX $MAKE_TARGET -j5
+    $ECHO "Building factor with $NUM_CORES cores"
+    invoke_make CC=$CC CXX=$CXX $MAKE_TARGET -j$NUM_CORES
 }
 
 make_clean_factor() {
@@ -544,6 +550,15 @@ make_clean_factor() {
     make_factor
 }
 
+current_git_branch() {
+    git rev-parse --abbrev-ref HEAD
+}
+
+checksum_url() {
+    branch=$(current_git_branch)
+    echo "http://downloads.factorcode.org/images/$branch/checksums.txt"
+}
+
 update_boot_images() {
     $ECHO "Deleting old images..."
     $DELETE checksums.txt* > /dev/null 2>&1
@@ -551,7 +566,7 @@ update_boot_images() {
     $DELETE $BOOT_IMAGE.{?,??} > /dev/null 2>&1
     $DELETE temp/staging.*.image > /dev/null 2>&1
     if [[ -f $BOOT_IMAGE ]] ; then
-        get_url http://downloads.factorcode.org/images/latest/checksums.txt
+        get_url $(checksum_url)
         factorcode_md5=`cat checksums.txt|grep $BOOT_IMAGE|cut -f2 -d' '`
         set_md5sum
         disk_md5=`$MD5SUM $BOOT_IMAGE|cut -f1 -d' '`
@@ -568,9 +583,14 @@ update_boot_images() {
     fi
 }
 
+boot_image_url() {
+    branch=$(current_git_branch)
+    echo "http://downloads.factorcode.org/images/$branch/$BOOT_IMAGE"
+}
+
 get_boot_image() {
     $ECHO "Downloading boot image $BOOT_IMAGE."
-    get_url http://downloads.factorcode.org/images/latest/$BOOT_IMAGE
+    get_url $(boot_image_url)
 }
 
 get_url() {
@@ -610,7 +630,6 @@ install() {
 
 update() {
     get_config_info
-    check_git_branch
     git_fetch_factorcode
     backup_factor
     make_clean_factor
diff --git a/extra/git/git-tests.factor b/extra/git/git-tests.factor
index b2c179ebd8..5022df4ba4 100644
--- a/extra/git/git-tests.factor
+++ b/extra/git/git-tests.factor
@@ -9,11 +9,9 @@ IN: git.tests
 
 : with-empty-test-git-repo ( quot -- )
     '[
-        [
-            { "git" "init" } run-process drop
-            @
-        ] cleanup-unique-directory
-    ] with-temp-directory ; inline
+        { "git" "init" } run-process drop
+        @
+    ] with-test-directory ; inline
 
 : with-zero-byte-file-repo ( quot -- )
     '[