diff --git a/gitstatus/build b/gitstatus/build
index f77f198..8190f47 100755
--- a/gitstatus/build
+++ b/gitstatus/build
@@ -55,7 +55,7 @@ workdir="$(command pwd)"
 
 narg() { echo $#; }
 
-if [ "$(narg $workdir)" != 1 -o -z "${workdir##*:*}" ]; then
+if [ "$(narg $workdir)" != 1 -o -z "${workdir##*:*}" -o -z "${workdir##*=*}" ]; then
   >&2 echo "[error] cannot build in this directory: $workdir"
   exit 1
 fi
@@ -138,6 +138,14 @@ esac
 
 cflags="$archflag=$gitstatus_cpu -fno-plt"
 
+command touch "$workdir"/file-prefix-map-test.c
+if 2>/dev/null "${CC:-/bin/cc}"           \
+     -ffile-prefix-map=x=y                \
+     -c "$workdir"/file-prefix-map-test.c \
+     -o "$workdir"/file-prefix-map-test.o; then
+  cflags="$cflags -ffile-prefix-map=$workdir/="
+fi
+
 if [ "$gitstatus_cpu" = x86-64 ]; then
   cflags="$cflags -mtune=generic"
 fi
@@ -450,13 +458,16 @@ fi
 
 if [ -z "$gitstatus_cpu" ]; then
   case "$gitstatus_arch" in
-    armv6l)         gitstatus_cpu=armv6;;
+    armel)          gitstatus_cpu=armv5;;
+    armv6l|armhf)   gitstatus_cpu=armv6;;
     armv7l)         gitstatus_cpu=armv7;;
     arm64)          gitstatus_cpu=armv8;;
     aarch64)        gitstatus_cpu=armv8-a;;
     ppc64le)        gitstatus_cpu=powerpc64le;;
     riscv64)        gitstatus_cpu=rv64imafdc;;
     x86_64|amd64)   gitstatus_cpu=x86-64;;
+    x86)            gitstatus_cpu=i586;;
+    s390x)          gitstatus_cpu=z900;;
     i386|i586|i686) gitstatus_cpu="$gitstatus_arch";;
     *)
       >&2 echo '[error] unable to infer target CPU architecture'
@@ -485,12 +496,13 @@ case "$gitstatus_kernel" in
       fi
       if [ -z "$docker_image" ]; then
         case "$gitstatus_arch" in
-          x86_64)         docker_image=alpine:3.11.6;;
-          i386|i586|i686) docker_image=i386/alpine:3.11.6;;
-          armv6l)         docker_image=arm32v6/alpine:3.11.6;;
-          armv7l)         docker_image=arm32v7/alpine:3.11.6;;
-          aarch64)        docker_image=arm64v8/alpine:3.11.6;;
-          ppc64le)        docker_image=ppc64le/alpine:3.11.6;;
+          x86_64)             docker_image=alpine:3.11.6;;
+          x86|i386|i586|i686) docker_image=i386/alpine:3.11.6;;
+          armv6l|armhf)       docker_image=arm32v6/alpine:3.11.6;;
+          armv7l)             docker_image=arm32v7/alpine:3.11.6;;
+          aarch64)            docker_image=arm64v8/alpine:3.11.6;;
+          ppc64le)            docker_image=ppc64le/alpine:3.11.6;;
+          s390x)              docker_image=s390x/alpine:3.11.6;;
           *)
             >&2 echo '[error] unable to infer docker image'
             >&2 echo 'Please specify explicitly with `-i IMAGE`.'
diff --git a/gitstatus/gitstatus.prompt.sh b/gitstatus/gitstatus.prompt.sh
index 9c1a213..f27bcc3 100644
--- a/gitstatus/gitstatus.prompt.sh
+++ b/gitstatus/gitstatus.prompt.sh
@@ -33,11 +33,11 @@ function gitstatus_prompt_update() {
   gitstatus_query "$@"                  || return 1  # error
   [[ "$VCS_STATUS_RESULT" == ok-sync ]] || return 0  # not a git repo
 
-  local      reset=$'\e[0m'         # no color
-  local      clean=$'\e[38;5;076m'  # green foreground
-  local  untracked=$'\e[38;5;014m'  # teal foreground
-  local   modified=$'\e[38;5;011m'  # yellow foreground
-  local conflicted=$'\e[38;5;196m'  # red foreground
+  local      reset=$'\001\e[0m\002'         # no color
+  local      clean=$'\001\e[38;5;076m\002'  # green foreground
+  local  untracked=$'\001\e[38;5;014m\002'  # teal foreground
+  local   modified=$'\001\e[38;5;011m\002'  # yellow foreground
+  local conflicted=$'\001\e[38;5;196m\002'  # red foreground
 
   local p