diff --git a/regress/gtest/Makefile.am b/regress/gtest/Makefile.am
index b8ab6bd..f0e3fdf 100644
--- a/regress/gtest/Makefile.am
+++ b/regress/gtest/Makefile.am
@@ -5,7 +5,7 @@
 # google test library
 GTEST_OBJS = gtest-1.6.0/src/gtest-all.cc
 
-GTEST_INCLUDE = -Igtest-1.6.0/include/gtest -Igtest-1.6.0/include -Igtest-1.6.0
+GTEST_INCLUDE = -I$(srcdir)/gtest-1.6.0/include/gtest -I$(srcdir)/gtest-1.6.0/include -I$(srcdir)/gtest-1.6.0
 
 GTEST_CXXFLAGS = -Dprivate=public -Dprotected=public 
 
@@ -45,7 +45,7 @@ GTEST_EXTRA_FILES = gtest-1.6.0/src/gtest-internal-inl.h \
 
 # simulavr bindings
 SIMULAVR_PATH = ../..
-SIMULAVR_INCLUDE = -I$(SIMULAVR_PATH)/src
+SIMULAVR_INCLUDE = -I$(top_srcdir)/src
 SIMULAVR_LIB = $(SIMULAVR_PATH)/src/.libs/libsim.la
 
 # design under test settings
diff --git a/src/Makefile.am b/src/Makefile.am
index c8b98e7..cff7d50 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -14,7 +14,7 @@ endif
 
 endif
 
-AM_CXXFLAGS=-Ielfio -g -O2 -fPIC -Icmd -Iui -Ihwtimer
+AM_CXXFLAGS=-I$(srcdir)/elfio -g -O2 -fPIC -I$(srcdir)/cmd -I$(srcdir)/ui -I$(srcdir)/hwtimer
 
 bin_PROGRAMS    = simulavr
 @MAINT@ noinst_PROGRAMS = kbdgentables