diff --git a/CMakeLists.txt b/CMakeLists.txt
index d06e9f76..17d18933 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,12 +9,14 @@ if(NOT PERL)
 	message(FATAL_ERROR "perl not found")
 endif(NOT PERL)
 
-set(LLVM_INSTDIR CACHE PATH "LLVM installation directory")
-
 find_program(LLVM_CONFIG llvm-config ${LLVM_INSTDIR}/bin DOC "path to llvm-config tool")
-if(NOT LLVM_CONFIG)
-	message(FATAL_ERROR "llvm-config not found")
-endif(NOT LLVM_CONFIG)
+# get llvm's install dir. a little hackish, we could do something like llvm-config --prefix, but this does as well
+string(REPLACE "/bin/llvm-config" "" LLVM_DIR ${LLVM_CONFIG})
+
+set(LLVM_INSTDIR ${LLVM_DIR} CACHE PATH "LLVM installation directory" FORCE)
+if(NOT LLVM_INSTDIR)
+	message(FATAL_ERROR "llvm not found")
+endif(NOT LLVM_INSTDIR)
 
 execute_process(
 	COMMAND ${PERL_EXECUTABLE} ${LLVM_CONFIG} --host-target
@@ -36,10 +38,10 @@ execute_process(
 	OUTPUT_VARIABLE LLVM_LIBS
 	OUTPUT_STRIP_TRAILING_WHITESPACE
 )
-# get llvm's install dir. a little hackish, we could do something like llvm-config --prefix, but this does as well
-string(REPLACE "/bin/llvm-config" "" LLVM_INSTDIR ${LLVM_CONFIG})
 
 set(D_VERSION 1 CACHE STRING "D language version")
+option(USE_BOEHM_GC "use the Boehm garbage collector internally")
+
 if(D_VERSION EQUAL 1)
 	set(DMDFE_PATH dmd)
 	set(LDC_EXE ldc)
@@ -69,6 +71,7 @@ add_executable(impcnvgen ${DMDFE_PATH}/impcnvgen.c)
 set_target_properties(
 	idgen impcnvgen PROPERTIES
 	LINKER_LANGUAGE CXX
+	RUNTIME_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/${DMDFE_PATH}
 )
 get_target_property(IDGEN_LOC idgen LOCATION)
 get_target_property(IMPCNVGEN_LOC impcnvgen LOCATION)
@@ -127,17 +130,21 @@ add_definitions(
 	-DIN_LLVM
 	-D_DH
 	-DOPAQUE_VTBLS
-	-DUSE_BOEHM_GC=0
 	-DX86_REVERSE_PARAMS
 	-DX86_PASS_IN_EAX
 )
 
 if(UNIX)
 	add_definitions(-DPOSIX)
-	#set(CONF_SUFFIX conf)
 endif(UNIX)
 
+if(USE_BOEHM_GC)
+	add_definitions(-DUSE_BOEHM_GC)
+endif(USE_BOEHM_GC)
+
 if(CMAKE_MINOR_VERSION LESS 6)
+	set(EXECUTABLE_OUTPUT_PATH ${PROJECT_BINARY_DIR}/bin CACHE PATH "output dir for built executables")
+	set(LIBRARY_OUTPUT_PATH ${PROJECT_BINARY_DIR}/lib CACHE PATH "output dir for built libraries")
 	add_definitions(-DDEFAULT_TARGET_TRIPLE=\\"${DEFAULT_TARGET}\\")
 else(CMAKE_MINOR_VERSION LESS 6)
 	add_definitions(-DDEFAULT_TARGET_TRIPLE="${DEFAULT_TARGET}")
@@ -155,27 +162,15 @@ set_target_properties(
 target_link_libraries(${LDC_EXE} "${LLVM_LDFLAGS} ${LLVM_LIBS}")
 if(WIN32)
 	target_link_libraries(${LDC_EXE} psapi)
-	#set(CONF_SUFFIX ini)
 endif(WIN32)
 
-# cmake pre 2.6 doesn't support the RUNTIME_OUTPUT_DIRECTORY target property
-if(CMAKE_MINOR_VERSION LESS 6)
-	get_target_property(LDC_LOC ${LDC_EXE} LOCATION)
-	add_custom_command(
-		TARGET ${LDC_EXE}
-		POST_BUILD
-		COMMAND ${CMAKE_COMMAND} -E copy ${LDC_LOC} ${PROJECT_BINARY_DIR}/bin/
-		COMMAND ${CMAKE_COMMAND} -E remove ${LDC_LOC}
-	)
-endif(CMAKE_MINOR_VERSION LESS 6)
+if(USE_BOEHM_GC)
+	target_link_libraries(${LDC_EXE} gc)
+endif(USE_BOEHM_GC)
+
+get_target_property(LDC_LOC ${LDC_EXE} LOCATION)
 
-#configure_file(${PROJECT_SOURCE_DIR}/ldc.conf.in ${PROJECT_BINARY_DIR}/bin/ldc.${CONF_SUFFIX})
-	
-# TODO: runtime build
-# possible problems:
-#	with an oos-build, how to set up a working environment, with conf/ini and tango in place?
-#	patch tango? how to determine if that's already been done?
-#	std but compatible runtime build, or shared, which doesn't yet work on every platform
-#	
 # TODO: install target
 # TODO: testrun
+
+add_subdirectory(runtime EXCLUDE_FROM_ALL)
diff --git a/bin/ldc.ini b/bin/ldc.ini
deleted file mode 100644
index 36ba9baa..00000000
--- a/bin/ldc.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[Environment]
-DFLAGS=-I%@P%/../tango -I%@P%/../tango/lib/common -L-L%@P%/../lib
diff --git a/dmd/mars.c b/dmd/mars.c
index 60fc0c79..2aacb602 100644
--- a/dmd/mars.c
+++ b/dmd/mars.c
@@ -345,13 +345,13 @@ int main(int argc, char *argv[], char** envp)
     //VersionCondition::addPredefinedGlobalIdent("D_Bits");
     VersionCondition::addPredefinedGlobalIdent("all");
 
-#if _WIN32
-    inifile(global.params.argv0, "ldc.ini");
-#elif POSIX
+//#if _WIN32
+//    inifile(global.params.argv0, "ldc.ini");
+//#elif POSIX
     inifile(global.params.argv0, "ldc.conf");
-#else
-#error
-#endif
+//#else
+//#error
+//#endif
     getenv_setargv("DFLAGS", &argc, &argv);
 
 #if 0
diff --git a/ldc.conf.in b/ldc.conf.in
new file mode 100644
index 00000000..8e9399d4
--- /dev/null
+++ b/ldc.conf.in
@@ -0,0 +1,2 @@
+[Environment]
+DFLAGS=-I@RUNTIME_DIR@ -I@RUNTIME_DIR@/lib/common -L-L%@P%/../lib -version=Tango -defaultlib=tango-ldc -debuglib=tango-ldc
diff --git a/ldc2.conf.in b/ldc2.conf.in
new file mode 100644
index 00000000..23043052
--- /dev/null
+++ b/ldc2.conf.in
@@ -0,0 +1,4 @@
+
+[Environment]
+
+DFLAGS=-I@RUNTIME_DIR@/import -L-L@RUNTIME_DIR@/lib