Index: lib/unittest.sh
===================================================================
--- lib/unittest.sh	(revision 4330)
+++ lib/unittest.sh	(working copy)
@@ -15,14 +15,14 @@
 usage() {
     echo 'Usage: ./unittest.sh [otions ...]
 Options:
-  --help: This message
+  --help:    This message
   --run-all: Reports result instead of breaking. Do not use this if you want to
-         run unittest runner through a debugger.
-  dmd:    Builds unittests for dmd
-  gdc:    Builds unittests for gdc
-  ldc: Builds unittests for ldc
+             run unittest runner through a debugger.
+  dmd:       Builds unittests for dmd
+  gdc:       Builds unittests for gdc
+  ldc:       Builds unittests for ldc
 
-  <none>: Builds unittests for all known compilers.'
+  <none>:    Builds unittests for all known compilers.'
   exit 0
 }
 
@@ -37,7 +37,7 @@
 
     rebuild --help >& /dev/null || die "rebuild required, aborting" 1
 
-    if ! $DC --help >& /dev/null
+    if ! which $DC >& /dev/null
     then
         echo "$DC not found on your \$PATH!"
     else
Index: lib/build-tango.sh
===================================================================
--- lib/build-tango.sh	(revision 4330)
+++ lib/build-tango.sh	(working copy)
@@ -131,7 +131,7 @@
     DC=$1
     LIB=$2
 
-    if ! $DC --help >& /dev/null
+    if ! which "$DC" >& /dev/null
     then
         echo "$DC not found on your \$PATH!"
         return
@@ -203,7 +203,7 @@
             build gdmd libgtango.a libgphobos.a
             ;;
         ldc)
-            build ldc libtango-user-ldc.a build-tango.sh
+            build ldmd libtango-user-ldc.a build-tango.sh
             ;;
         mac)
             POSIXFLAG="-version=Posix"