diff --git a/configure.ac b/configure.ac
index b00f0a3..55afcd6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -26,7 +26,7 @@ if test "$build" != "$host" -a "${PKG_CONFIG_LIBDIR}" = ""; then
 fi
 
 CACA="no"
-PKG_CHECK_MODULES(caca, caca >= 0.99.beta9,
+PKG_CHECK_MODULES(CACA, caca >= 0.99.beta9,
  [CACA="yes"],
  [AC_MSG_RESULT(no)
   AC_MSG_ERROR([you need libcaca version 0.99.beta9 or later])])
diff --git a/src/Makefile.am b/src/Makefile.am
index 0b18baa..e8b4cbf 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -2,6 +2,6 @@
 bin_PROGRAMS = cacatris
 
 cacatris_SOURCES = main.c
-cacatris_CFLAGS = `pkg-config --cflags caca`
-cacatris_LDFLAGS = `pkg-config --libs caca`
+cacatris_CFLAGS = @CACA_CFLAGS@
+cacatris_LDFLAGS = @CACA_LIBS@