Fix dependency checking on osx

buildscripts/checkdeps.sh

@@ -32,6 +32,27 @@ _init() {
     MISSING=""
 }
 
+readlink() {
+    TARGET_FILE=$1
+
+    cd `dirname $TARGET_FILE`
+    TARGET_FILE=`basename $TARGET_FILE`
+
+    # Iterate down a (possible) chain of symlinks
+    while [ -L "$TARGET_FILE" ]
+    do
+        TARGET_FILE=$(env readlink $TARGET_FILE)
+        cd `dirname $TARGET_FILE`
+        TARGET_FILE=`basename $TARGET_FILE`
+    done
+
+    # Compute the canonicalized name by finding the physical path
+    # for the directory we're in and appending the target file.
+    PHYS_DIR=`pwd -P`
+    RESULT=$PHYS_DIR/$TARGET_FILE
+    echo $RESULT
+}
+
 ###
 #
 # Takes two arguments
@@ -106,7 +127,7 @@ check_golang_env() {
 
     local new_go_binary_path=${go_binary_path}
     if [ -h "${go_binary_path}" ]; then
-        new_go_binary_path=$(/bin/readlink -f ${go_binary_path})
+        new_go_binary_path=$(readlink ${go_binary_path})
     fi
 
     if [[ !"$(dirname ${new_go_binary_path})" =~ *"${GOROOT%%*(/)}"* ]] ; then