Makefile: reworked builder detection a bit

1 files changed, 11 insertions, 16 deletions

diff --git a/Makefile b/Makefile
index f4638dd..2e8c054 100644
--- a/Makefile
+++ b/Makefile
@@ -8,28 +8,23 @@ SUPPORTED_BUILDERS = qemu virtualbox-iso vmware-iso
 # check which hypervisors are available
 ifeq ($(shell which qemu-system-$(shell uname -m | sed 's/i686/i386/') 2>&1 > /dev/null && echo $$?), 0)
     AVAILABLE_BUILDERS += qemu
-    BUILDER := qemu
+    DEFAULT_BUILDER := qemu
 endif
-ifndef BUILDER
-    ifeq ($(shell which virtualbox 2>&1 > /dev/null && echo $$?), 0)
-        AVAILABLE_BUILDERS += virtualbox-iso
-        BUILDER := virtualbox-iso
+ifeq ($(shell which virtualbox 2>&1 > /dev/null && echo $$?), 0)
+    AVAILABLE_BUILDERS += virtualbox-iso
+    ifndef DEFAULT_BUILDER
+        DEFAULT_BUILDER := virtualbox-iso
     endif
 endif
-ifndef BUILDER
-    ifeq ($(shell which vmplayer 2>&1 > /dev/null && echo $$?), 0)
-        AVAILABLE_BUILDERS += vmware-iso
-        BUILDER := vmware-iso
+ifeq ($(shell which vmplayer 2>&1 > /dev/null && echo $$?), 0)
+    AVAILABLE_BUILDERS += vmware-iso
+    ifndef DEFAULT_BUILDER
+        DEFAULT_BUILDER := vmware-iso
     endif
 endif
 ifndef BUILDER
-    $(error No usable builder found! Please install a hypervisor...)
-endif
-MISSING_BUILDERS = $(filter-out $(AVAILABLE_BUILDERS),$(SUPPORTED_BUILDERS))
-ifneq ($(words $(MISSING_BUILDERS)), 0)
-    $(info Builders missing on this system: $(MISSING_BUILDERS))
-    $(info If you wish to use these, install the corresponding hypervisor and retry.)
-    $(info )
+    $(info # BUILDER not set, using default builder: $(DEFAULT_BUILDER))
+		BUILDER := $(DEFAULT_BUILDER)
 endif
 
 ##