diff --git a/pkgs/build-support/gcc-wrapper/add-flags b/pkgs/build-support/gcc-wrapper/add-flags
index 26e536f6d57..ede1a868303 100644
--- a/pkgs/build-support/gcc-wrapper/add-flags
+++ b/pkgs/build-support/gcc-wrapper/add-flags
@@ -1,27 +1,27 @@
 # `-B@out@/bin' forces gcc to use ld-wrapper.sh when calling ld.
 export NIX_CFLAGS_COMPILE="-B@out@/bin/ $NIX_CFLAGS_COMPILE"
 
-if test -e @out@/nix-support/libc-cflags; then
+if [ -e @out@/nix-support/libc-cflags ]; then
     export NIX_CFLAGS_COMPILE="$(cat @out@/nix-support/libc-cflags) $NIX_CFLAGS_COMPILE"
 fi
 
-if test -e @out@/nix-support/gcc-cflags; then
+if [ -e @out@/nix-support/gcc-cflags ]; then
     export NIX_CFLAGS_COMPILE="$(cat @out@/nix-support/gcc-cflags) $NIX_CFLAGS_COMPILE"
 fi
 
-if test -e @out@/nix-support/gnat-cflags; then
+if [ -e @out@/nix-support/gnat-cflags ]; then
     export NIX_GNATFLAGS_COMPILE="$(cat @out@/nix-support/gnat-cflags) $NIX_GNATFLAGS_COMPILE"
 fi
 
-if test -e @out@/nix-support/libc-ldflags; then
+if [ -e @out@/nix-support/libc-ldflags ]; then
     export NIX_LDFLAGS="$NIX_LDFLAGS $(cat @out@/nix-support/libc-ldflags)"
 fi
 
-if test -e @out@/nix-support/gcc-ldflags; then
+if [ -e @out@/nix-support/gcc-ldflags ]; then
     export NIX_LDFLAGS="$NIX_LDFLAGS $(cat @out@/nix-support/gcc-ldflags)"
 fi
 
-if test -e @out@/nix-support/libc-ldflags-before; then
+if [ -e @out@/nix-support/libc-ldflags-before ]; then
     export NIX_LDFLAGS_BEFORE="$(cat @out@/nix-support/libc-ldflags-before) $NIX_LDFLAGS_BEFORE"
 fi
 
diff --git a/pkgs/build-support/gcc-wrapper/gcc-wrapper.sh b/pkgs/build-support/gcc-wrapper/gcc-wrapper.sh
index f515fafdac0..d0c82c82dc1 100644
--- a/pkgs/build-support/gcc-wrapper/gcc-wrapper.sh
+++ b/pkgs/build-support/gcc-wrapper/gcc-wrapper.sh
@@ -1,10 +1,10 @@
 #! @shell@ -e
 
-if test -n "$NIX_GCC_WRAPPER_START_HOOK"; then
+if [ -n "$NIX_GCC_WRAPPER_START_HOOK" ]; then
     source "$NIX_GCC_WRAPPER_START_HOOK"
 fi
 
-if test -z "$NIX_GCC_WRAPPER_FLAGS_SET"; then
+if [ -z "$NIX_GCC_WRAPPER_FLAGS_SET" ]; then
     source @out@/nix-support/add-flags.sh
 fi
 
@@ -18,26 +18,26 @@ getVersion=0
 nonFlagArgs=0
 
 for i in "$@"; do
-    if test "$i" = "-c"; then
+    if [ "$i" = -c ]; then
         dontLink=1
-    elif test "$i" = "-S"; then
+    elif [ "$i" = -S ]; then
         dontLink=1
-    elif test "$i" = "-E"; then
+    elif [ "$i" = -E ]; then
         dontLink=1
-    elif test "$i" = "-E"; then
+    elif [ "$i" = -E ]; then
         dontLink=1
-    elif test "$i" = "-M"; then
+    elif [ "$i" = -M ]; then
         dontLink=1
-    elif test "$i" = "-MM"; then
+    elif [ "$i" = -MM ]; then
         dontLink=1
-    elif test "$i" = "-x"; then
+    elif [ "$i" = -x ]; then
         # At least for the cases c-header or c++-header we should set dontLink.
         # I expect no one use -x other than making precompiled headers.
         dontLink=1
-    elif test "${i:0:1}" != "-"; then
+    elif [ "${i:0:1}" != - ]; then
         nonFlagArgs=1
-    elif test "$i" = "-m32"; then
-        if test -e @out@/nix-support/dynamic-linker-m32; then
+    elif [ "$i" = -m32 ]; then
+        if [ -e @out@/nix-support/dynamic-linker-m32 ]; then
             NIX_LDFLAGS="$NIX_LDFLAGS -dynamic-linker $(cat @out@/nix-support/dynamic-linker-m32)"
         fi
     fi
@@ -48,28 +48,28 @@ done
 # "-c" flag).  So if no non-flag arguments are given, don't pass any
 # linker flags.  This catches cases like "gcc" (should just print
 # "gcc: no input files") and "gcc -v" (should print the version).
-if test "$nonFlagArgs" = "0"; then
+if [ "$nonFlagArgs" = 0 ]; then
     dontLink=1
 fi
 
 
 # Optionally filter out paths not refering to the store.
 params=("$@")
-if test "$NIX_ENFORCE_PURITY" = "1" -a -n "$NIX_STORE"; then
+if [ "$NIX_ENFORCE_PURITY" = 1 -a -n "$NIX_STORE" ]; then
     rest=()
     n=0
-    while test $n -lt ${#params[*]}; do
+    while [ $n -lt ${#params[*]} ]; do
         p=${params[n]}
         p2=${params[$((n+1))]}
-        if test "${p:0:3}" = "-L/" && badPath "${p:2}"; then
+        if [ "${p:0:3}" = -L/ ] && badPath "${p:2}"; then
             skip $p
-        elif test "$p" = "-L" && badPath "$p2"; then
+        elif [ "$p" = -L ] && badPath "$p2"; then
             n=$((n + 1)); skip $p2
-        elif test "${p:0:3}" = "-I/" && badPath "${p:2}"; then
+        elif [ "${p:0:3}" = -I/ ] && badPath "${p:2}"; then
             skip $p
-        elif test "$p" = "-I" && badPath "$p2"; then
+        elif [ "$p" = -I ] && badPath "$p2"; then
             n=$((n + 1)); skip $p2
-        elif test "$p" = "-isystem" && badPath "$p2"; then
+        elif [ "$p" = -isystem ] && badPath "$p2"; then
             n=$((n + 1)); skip $p2
         else
             rest=("${rest[@]}" "$p")
@@ -86,14 +86,14 @@ extraBefore=()
 
 # When enforcing purity, pretend gcc can't find the current date and
 # time
-if test "$NIX_ENFORCE_PURITY" = "1"; then
+if [ "$NIX_ENFORCE_PURITY" = 1 ]; then
     extraAfter+=('-D__DATE__="Jan 01 1970"'
         '-D__TIME__="00:00:01"'
         -Wno-builtin-macro-redefined)
 fi
 
 
-if test "$dontLink" != "1"; then
+if [ "$dontLink" != 1 ]; then
 
     # Add the flags that should only be passed to the compiler when
     # linking.
@@ -105,11 +105,11 @@ if test "$dontLink" != "1"; then
         extraBefore=(${extraBefore[@]} "-Wl,$i")
     done
     for i in $NIX_LDFLAGS; do
-	if test "${i:0:3}" = "-L/"; then
-	    extraAfter+=("$i")
-	else
-	    extraAfter+=("-Wl,$i")
-	fi
+        if [ "${i:0:3}" = -L/ ]; then
+            extraAfter+=("$i")
+        else
+            extraAfter+=("-Wl,$i")
+        fi
     done
     export NIX_LDFLAGS_SET=1
 fi
@@ -118,13 +118,13 @@ fi
 # add anything.  This is to prevent `gcc -v' (which normally prints
 # out the version number and returns exit code 0) from printing out
 # `No input files specified' and returning exit code 1.
-if test "$*" = "-v"; then
+if [ "$*" = -v ]; then
     extraAfter=()
     extraBefore=()
-fi    
+fi
 
 # Optionally print debug info.
-if test "$NIX_DEBUG" = "1"; then
+if [ -n "$NIX_DEBUG" ]; then
   echo "original flags to @prog@:" >&2
   for i in "${params[@]}"; do
       echo "  $i" >&2
@@ -139,7 +139,7 @@ if test "$NIX_DEBUG" = "1"; then
   done
 fi
 
-if test -n "$NIX_GCC_WRAPPER_EXEC_HOOK"; then
+if [ -n "$NIX_GCC_WRAPPER_EXEC_HOOK" ]; then
     source "$NIX_GCC_WRAPPER_EXEC_HOOK"
 fi
 
diff --git a/pkgs/build-support/gcc-wrapper/gnat-wrapper.sh b/pkgs/build-support/gcc-wrapper/gnat-wrapper.sh
index 3c2f1d03474..3514ccd6732 100644
--- a/pkgs/build-support/gcc-wrapper/gnat-wrapper.sh
+++ b/pkgs/build-support/gcc-wrapper/gnat-wrapper.sh
@@ -1,10 +1,10 @@
 #! @shell@ -e
 
-if test -n "$NIX_GNAT_WRAPPER_START_HOOK"; then
+if [ -n "$NIX_GNAT_WRAPPER_START_HOOK" ]; then
     source "$NIX_GNAT_WRAPPER_START_HOOK"
 fi
 
-if test -z "$NIX_GNAT_WRAPPER_FLAGS_SET"; then
+if [ -z "$NIX_GNAT_WRAPPER_FLAGS_SET" ]; then
     source @out@/nix-support/add-flags.sh
 fi
 
@@ -18,14 +18,14 @@ getVersion=0
 nonFlagArgs=0
 
 for i in "$@"; do
-    if test "$i" = "-c"; then
+    if [ "$i" = -c ]; then
         dontLink=1
-    elif test "$i" = "-M"; then
+    elif [ "$i" = -M ]; then
         dontLink=1
-    elif test "${i:0:1}" != "-"; then
+    elif [ "${i:0:1}" != - ]; then
         nonFlagArgs=1
-    elif test "$i" = "-m32"; then
-        if test -e @out@/nix-support/dynamic-linker-m32; then
+    elif [ "$i" = -m32 ]; then
+        if [ -e @out@/nix-support/dynamic-linker-m32 ]; then
             NIX_LDFLAGS="$NIX_LDFLAGS -dynamic-linker $(cat @out@/nix-support/dynamic-linker-m32)"
         fi
     fi
@@ -36,26 +36,26 @@ done
 # "-c" flag).  So if no non-flag arguments are given, don't pass any
 # linker flags.  This catches cases like "gcc" (should just print
 # "gcc: no input files") and "gcc -v" (should print the version).
-if test "$nonFlagArgs" = "0"; then
+if [ "$nonFlagArgs" = 0 ]; then
     dontLink=1
 fi
 
 
 # Optionally filter out paths not refering to the store.
 params=("$@")
-if test "$NIX_ENFORCE_PURITY" = "1" -a -n "$NIX_STORE"; then
+if [ "$NIX_ENFORCE_PURITY" = 1 -a -n "$NIX_STORE" ]; then
     rest=()
     n=0
-    while test $n -lt ${#params[*]}; do
+    while [ $n -lt ${#params[*]} ]; do
         p=${params[n]}
         p2=${params[$((n+1))]}
-        if test "${p:0:3}" = "-L/" && badPath "${p:2}"; then
+        if [ "${p:0:3}" = -L/ ] && badPath "${p:2}"; then
             skip $p
-        elif test "${p:0:3}" = "-I/" && badPath "${p:2}"; then
+        elif [ "${p:0:3}" = -I/ ] && badPath "${p:2}"; then
             skip $p
-        elif test "${p:0:4}" = "-aI/" && badPath "${p:3}"; then
+        elif [ "${p:0:4}" = -aI/ ] && badPath "${p:3}"; then
             skip $p
-        elif test "${p:0:4}" = "-aO/" && badPath "${p:3}"; then
+        elif [ "${p:0:4}" = -aO/ ] && badPath "${p:3}"; then
             skip $p
         else
             rest=("${rest[@]}" "$p")
@@ -81,7 +81,7 @@ fi
 #done
 
 # Optionally print debug info.
-if test "$NIX_DEBUG" = "1"; then
+if [ -n "$NIX_DEBUG" ]; then
   echo "original flags to @prog@:" >&2
   for i in "${params[@]}"; do
       echo "  $i" >&2
@@ -96,7 +96,7 @@ if test "$NIX_DEBUG" = "1"; then
   done
 fi
 
-if test -n "$NIX_GNAT_WRAPPER_EXEC_HOOK"; then
+if [ -n "$NIX_GNAT_WRAPPER_EXEC_HOOK" ]; then
     source "$NIX_GNAT_WRAPPER_EXEC_HOOK"
 fi
 
diff --git a/pkgs/build-support/gcc-wrapper/gnatlink-wrapper.sh b/pkgs/build-support/gcc-wrapper/gnatlink-wrapper.sh
index cd7768c85a3..c9958dbbb41 100644
--- a/pkgs/build-support/gcc-wrapper/gnatlink-wrapper.sh
+++ b/pkgs/build-support/gcc-wrapper/gnatlink-wrapper.sh
@@ -11,7 +11,7 @@ extraBefore=()
 #done
 
 # Optionally print debug info.
-if test "$NIX_DEBUG" = "1"; then
+if [ -n "$NIX_DEBUG" ]; then
   echo "original flags to @prog@:" >&2
   for i in "$@"; do
       echo "  $i" >&2
@@ -26,7 +26,7 @@ if test "$NIX_DEBUG" = "1"; then
   done
 fi
 
-if test -n "$NIX_GNAT_WRAPPER_EXEC_HOOK"; then
+if [ -n "$NIX_GNAT_WRAPPER_EXEC_HOOK" ]; then
     source "$NIX_GNAT_WRAPPER_EXEC_HOOK"
 fi
 
diff --git a/pkgs/build-support/gcc-wrapper/ld-wrapper.sh b/pkgs/build-support/gcc-wrapper/ld-wrapper.sh
index df00dcdb222..894dbf9a352 100644
--- a/pkgs/build-support/gcc-wrapper/ld-wrapper.sh
+++ b/pkgs/build-support/gcc-wrapper/ld-wrapper.sh
@@ -1,10 +1,10 @@
 #! @shell@ -e
 
-if test -n "$NIX_LD_WRAPPER_START_HOOK"; then
+if [ -n "$NIX_LD_WRAPPER_START_HOOK" ]; then
     source "$NIX_LD_WRAPPER_START_HOOK"
 fi
 
-if test -z "$NIX_GCC_WRAPPER_FLAGS_SET"; then
+if [ -z "$NIX_GCC_WRAPPER_FLAGS_SET" ]; then
     source @out@/nix-support/add-flags.sh
 fi
 
@@ -13,26 +13,26 @@ source @out@/nix-support/utils.sh
 
 # Optionally filter out paths not refering to the store.
 params=("$@")
-if test "$NIX_ENFORCE_PURITY" = "1" -a -n "$NIX_STORE" \
-        -a \( -z "$NIX_IGNORE_LD_THROUGH_GCC" -o -z "$NIX_LDFLAGS_SET" \); then
+if [ "$NIX_ENFORCE_PURITY" = 1 -a -n "$NIX_STORE" \
+        -a \( -z "$NIX_IGNORE_LD_THROUGH_GCC" -o -z "$NIX_LDFLAGS_SET" \) ]; then
     rest=()
     n=0
-    while test $n -lt ${#params[*]}; do
+    while [ $n -lt ${#params[*]} ]; do
         p=${params[n]}
         p2=${params[$((n+1))]}
-        if test "${p:0:3}" = "-L/" && badPath "${p:2}"; then
+        if [ "${p:0:3}" = -L/ ] && badPath "${p:2}"; then
             skip $p
-        elif test "$p" = "-L" && badPath "$p2"; then
+        elif [ "$p" = -L ] && badPath "$p2"; then
             n=$((n + 1)); skip $p2
-        elif test "$p" = "-rpath" && badPath "$p2"; then
+        elif [ "$p" = -rpath ] && badPath "$p2"; then
             n=$((n + 1)); skip $p2
-        elif test "$p" = "-dynamic-linker" && badPath "$p2"; then
+        elif [ "$p" = -dynamic-linker ] && badPath "$p2"; then
             n=$((n + 1)); skip $p2
-        elif test "${p:0:1}" = "/" && badPath "$p"; then
+        elif [ "${p:0:1}" = / ] && badPath "$p"; then
             # We cannot skip this; barf.
             echo "impure path \`$p' used in link" >&2
             exit 1
-        elif test "${p:0:9}" = "--sysroot"; then
+        elif [ "${p:0:9}" = --sysroot ]; then
             # Our ld is not built with sysroot support (Can we fix that?)
             :
         else
@@ -47,7 +47,7 @@ fi
 extra=()
 extraBefore=()
 
-if test -z "$NIX_LDFLAGS_SET"; then
+if [ -z "$NIX_LDFLAGS_SET" ]; then
     extra+=($NIX_LDFLAGS)
     extraBefore+=($NIX_LDFLAGS_BEFORE)
 fi
@@ -56,12 +56,12 @@ extra+=($NIX_LDFLAGS_AFTER)
 
 
 # Add all used dynamic libraries to the rpath.
-if test "$NIX_DONT_SET_RPATH" != "1"; then
+if [ "$NIX_DONT_SET_RPATH" != 1 ]; then
 
     libPath=""
     addToLibPath() {
         local path="$1"
-        if test "${path:0:1}" != "/"; then return 0; fi
+        if [ "${path:0:1}" != / ]; then return 0; fi
         case "$path" in
             *..*|*./*|*/.*|*//*)
                 local path2
@@ -75,12 +75,12 @@ if test "$NIX_DONT_SET_RPATH" != "1"; then
         esac
         libPath="$libPath $path "
     }
-    
+
     addToRPath() {
         # If the path is not in the store, don't add it to the rpath.
         # This typically happens for libraries in /tmp that are later
         # copied to $out/lib.  If not, we're screwed.
-        if test "${1:0:${#NIX_STORE}}" != "$NIX_STORE"; then return 0; fi
+        if [ "${1:0:${#NIX_STORE}}" != "$NIX_STORE" ]; then return 0; fi
         case $rpath in
             *\ $1\ *) return 0 ;;
         esac
@@ -97,21 +97,21 @@ if test "$NIX_DONT_SET_RPATH" != "1"; then
     # First, find all -L... switches.
     allParams=("${params[@]}" ${extra[@]})
     n=0
-    while test $n -lt ${#allParams[*]}; do
+    while [ $n -lt ${#allParams[*]} ]; do
         p=${allParams[n]}
         p2=${allParams[$((n+1))]}
-        if test "${p:0:3}" = "-L/"; then
+        if [ "${p:0:3}" = -L/ ]; then
             addToLibPath ${p:2}
-        elif test "$p" = "-L"; then
+        elif [ "$p" = -L ]; then
             addToLibPath ${p2}
             n=$((n + 1))
-        elif test "$p" = "-l"; then
+        elif [ "$p" = -l ]; then
             addToLibs ${p2}
             n=$((n + 1))
-        elif test "${p:0:2}" = "-l"; then
+        elif [ "${p:0:2}" = -l ]; then
             addToLibs ${p:2}
-        elif test "$p" = "-dynamic-linker"; then
-            # Ignore the dynamic linker argument, or it 
+        elif [ "$p" = -dynamic-linker ]; then
+            # Ignore the dynamic linker argument, or it
             # will get into the next 'elif'. We don't want
             # the dynamic linker path rpath to go always first.
             n=$((n + 1))
@@ -129,16 +129,16 @@ if test "$NIX_DONT_SET_RPATH" != "1"; then
     # so, add the directory to the rpath.
     # It's important to add the rpath in the order of -L..., so
     # the link time chosen objects will be those of runtime linking.
-    
+
     for i in $libPath; do
         for j in $libs; do
-            if test -f "$i/lib$j.so"; then
+            if [ -f "$i/lib$j.so" ]; then
                 addToRPath $i
                 break
             fi
         done
     done
-    
+
 
     # Finally, add `-rpath' switches.
     for i in $rpath; do
@@ -148,7 +148,7 @@ fi
 
 
 # Optionally print debug info.
-if test "$NIX_DEBUG" = "1"; then
+if [ -n "$NIX_DEBUG" ]; then
   echo "original flags to @prog@:" >&2
   for i in "${params[@]}"; do
       echo "  $i" >&2
@@ -159,7 +159,7 @@ if test "$NIX_DEBUG" = "1"; then
   done
 fi
 
-if test -n "$NIX_LD_WRAPPER_EXEC_HOOK"; then
+if [ -n "$NIX_LD_WRAPPER_EXEC_HOOK" ]; then
     source "$NIX_LD_WRAPPER_EXEC_HOOK"
 fi
 
diff --git a/pkgs/build-support/gcc-wrapper/setup-hook.sh b/pkgs/build-support/gcc-wrapper/setup-hook.sh
index a3ada9e984f..93b20fa1e99 100644
--- a/pkgs/build-support/gcc-wrapper/setup-hook.sh
+++ b/pkgs/build-support/gcc-wrapper/setup-hook.sh
@@ -1,15 +1,15 @@
 export NIX_GCC=@out@
 
 addCVars () {
-    if test -d $1/include; then
+    if [ -d $1/include ]; then
         export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -isystem $1/include"
     fi
 
-    if test -d $1/lib64; then
+    if [ -d $1/lib64 -a ! -L $1/lib64 ]; then
         export NIX_LDFLAGS="$NIX_LDFLAGS -L$1/lib64"
     fi
 
-    if test -d $1/lib; then
+    if [ -d $1/lib ]; then
         export NIX_LDFLAGS="$NIX_LDFLAGS -L$1/lib"
     fi
 }
@@ -18,18 +18,18 @@ envHooks+=(addCVars)
 
 # Note: these come *after* $out in the PATH (see setup.sh).
 
-if test -n "@gcc@"; then
+if [ -n "@gcc@" ]; then
     addToSearchPath PATH @gcc@/bin
 fi
 
-if test -n "@binutils@"; then
+if [ -n "@binutils@" ]; then
     addToSearchPath PATH @binutils@/bin
 fi
 
-if test -n "@libc@"; then
+if [ -n "@libc@" ]; then
     addToSearchPath PATH @libc@/bin
 fi
 
-if test -n "@coreutils@"; then
+if [ -n "@coreutils@" ]; then
     addToSearchPath PATH @coreutils@/bin
 fi
diff --git a/pkgs/build-support/gcc-wrapper/utils.sh b/pkgs/build-support/gcc-wrapper/utils.sh
index 753b3772e95..3ab512d85c4 100644
--- a/pkgs/build-support/gcc-wrapper/utils.sh
+++ b/pkgs/build-support/gcc-wrapper/utils.sh
@@ -1,5 +1,5 @@
 skip () {
-    if test "$NIX_DEBUG" = "1"; then
+    if [ -n "$NIX_DEBUG" ]; then
         echo "skipping impure path $1" >&2
     fi
 }
@@ -9,11 +9,11 @@ skip () {
 # `/nix/store/.../lib/foo.so' isn't.
 badPath() {
     local p=$1
-    
+
     # Relative paths are okay (since they're presumably relative to
     # the temporary build directory).
-    if test "${p:0:1}" != "/"; then return 1; fi
-    
+    if [ "${p:0:1}" != / ]; then return 1; fi
+
     # Otherwise, the path should refer to the store or some temporary
     # directory (including the build directory).
     test \