diff --git a/Installation/build.sh b/Installation/build.sh
index 38f5f203e6..b7bcc82e51 100755
--- a/Installation/build.sh
+++ b/Installation/build.sh
@@ -54,54 +54,62 @@ case $TRI_OS_LONG in
 
   Linux-ArchLinux*)
     echo "Using configuration for Arch Linux"
-    OPTIONS="$OPTIONS --enable-mruby"
+    OPTIONS="$OPTIONS --disable-mruby"
     LDD_INFO="yes"
     RESULTS="$RESULTS arangoirb"
     ;;
 
   Linux-LinuxMint-13*)
     echo "Using configuration for LinuxMint 13"
-    OPTIONS="$OPTIONS --enable-mruby"
+    OPTIONS="$OPTIONS --disable-mruby"
     LDD_INFO="yes"
     RESULTS="$RESULTS arangoirb"
     ;;
 
   Linux-openSUSE-12*)
     echo "Using configuration for openSuSE 12.X"
-    OPTIONS="$OPTIONS --enable-flex --enable-bison --enable-mruby "
+    OPTIONS="$OPTIONS --enable-flex --enable-bison --disable-mruby "
     LDD_INFO="yes"
     RESULTS="$RESULTS arangoirb"
     ;;
 
   Linux-openSUSE-11*)
     echo "Using configuration for openSuSE 11.X"
-    OPTIONS="$OPTIONS --enable-mruby"
+    OPTIONS="$OPTIONS --disable-mruby"
     LDD_INFO="yes"
     RESULTS="$RESULTS arangoirb"
     ;;
 
   Linux-Debian-6*)
     echo "Using configuration for Debian"
-    OPTIONS="$OPTIONS --enable-all-in-one-libev --enable-all-in-one-v8 --enable-mruby"
+    OPTIONS="$OPTIONS --enable-all-in-one-libev --enable-all-in-one-v8 --disable-mruby"
     LDD_INFO="yes"
     RESULTS="$RESULTS arangoirb"
     ;;
 
   Linux-Debian*)
     echo "Using configuration for Debian"
-    OPTIONS="$OPTIONS --enable-all-in-one-libev --enable-all-in-one-v8 --enable-all-in-one-icu --enable-mruby"
+    OPTIONS="$OPTIONS --enable-all-in-one-libev --enable-all-in-one-v8 --enable-all-in-one-icu --disable-mruby"
     LDD_INFO="yes"
     ;;
 
-  Linux-CentOS-*)
+  Linux-CentOS-6*)
     echo "Using configuration for Centos"
-    OPTIONS="$OPTIONS --enable-all-in-one-libev --enable-all-in-one-v8 --enable-all-in-one-icu --enable-mruby"
+    OPTIONS="$OPTIONS --enable-all-in-one-libev --enable-all-in-one-v8 --enable-all-in-one-icu --disable-mruby"
     LDD_INFO="yes"
     ;;
 
+  Linux-CentOS-5*)
+    echo "Using configuration for Centos"
+    OPTIONS="$OPTIONS --enable-all-in-one-libev --enable-all-in-one-v8 --enable-all-in-one-icu --disable-mruby"
+    LDD_INFO="yes"
+    # bugfix for readline on CentOS 5:
+    export LIBS="-lncurses"
+    ;;
+
   Linux-Ubuntu-*)
     echo "Using configuration for Ubuntu"
-    OPTIONS="$OPTIONS --enable-all-in-one-libev --enable-all-in-one-v8 --enable-mruby"
+    OPTIONS="$OPTIONS --enable-all-in-one-libev --enable-all-in-one-v8 --disable-mruby"
     LDD_INFO="yes"
     RESULTS="$RESULTS arangoirb"
     ;;
@@ -110,7 +118,7 @@ case $TRI_OS_LONG in
     echo "Using configuration for DARWIN"
     CPPFLAGS='-isystem /usr/include -isystem /opt/local/include -Wno-deprecated-declarations'
     LDFLAGS='-L/usr/lib -L/opt/local/lib' # need to use OpenSSL from system
-    OPTIONS="$OPTIONS --enable-mruby"
+    OPTIONS="$OPTIONS --enable-all-in-one-libev --enable-all-in-one-v8 --enable-all-in-one-icu --disable-mruby"
     RESULTS="$RESULTS arangoirb"
     ;;
 
@@ -147,6 +155,9 @@ echo
 
 ./configure $PREFIX $OPTIONS || exit 1
 
+# bugfix for readline on CentOS 5:
+unset LIBS
+
 echo
 echo "########################################################"
 echo "compile:"