diff --git a/Makefile b/Makefile
index 03bc0e6..52dbba5 100644
--- a/Makefile
+++ b/Makefile
@@ -9,7 +9,7 @@ INSTALL_PREFIX ?= dist
 # Internal variables
 override CFLAGS              = -Wall -Wextra -Werror -pedantic -Isrc
 override LIBFLAGS            = -fPIC
-override ABS_INSTALL_PREFIX != readlink -f $(INSTALL_PREFIX)
+override ABS_INSTALL_PREFIX := $(shell mkdir -p $(INSTALL_PREFIX) && realpath $(INSTALL_PREFIX))
 override CSTD               := -std=gnu11
 override CXXSTD             := -std=gnu++11
 override KERNEL             := $(shell uname -s)
diff --git a/build b/build
index 8d16d0e..e36c12d 100755
--- a/build
+++ b/build
@@ -6,7 +6,7 @@ BOLD="\033[1m"
 NC="\033[0m" # No Color
 
 BUILD_TYPE="Debug"
-ACCEPTED_BUILD_TYPES=("RelWithDebInfo" "Debug" "Release")
+ACCEPTED_BUILD_TYPES=("Debug" "RelWithDebInfo" "Release")
 KERNEL="$(uname -s)"
 ARGS=""
 
@@ -15,6 +15,15 @@ join_array_elements() {
   echo "$*"
 }
 
+contains() {
+  local item="$1"; shift
+  local e
+  for e; do
+    [[ "$e" == "$item" ]] && return 0
+  done
+  return 1
+}
+
 print_usage() {
   echo -e "Usage: build [-b build_type] ..."
   echo -e "  Options:"
@@ -40,10 +49,7 @@ while [[ $# > 0 ]];do
   esac
 done
 
-# Compare build type against array
-# From this: https://www.baeldung.com/linux/check-bash-array-contains-value#using-anifcondition-with-aregex-pattern
-build_regex="\<${BUILD_TYPE}\>"
-if [[ ! ${ACCEPTED_BUILD_TYPES[@]} =~ $build_regex ]]; then
+if ! contains ${BUILD_TYPE} "${ACCEPTED_BUILD_TYPES[@]}"; then
   echo -e "${RED}${BOLD}Unknown build type: ${BUILD_TYPE}${NC}\n"
   print_usage
   exit 1