--- a/libpjproject.pc.in
+++ b/libpjproject.pc.in
@@ -2,8 +2,8 @@
 
 prefix=@PREFIX@
 exec_prefix=${prefix}
-libdir=@LIBDIR@
-includedir=@INCLUDEDIR@
+libdir=${exec_prefix}/lib
+includedir=${prefix}/include
 
 Name: libpjproject
 Description: Multimedia communication library
--- a/build.mak.in
+++ b/build.mak.in
@@ -348,6 +348,6 @@ export PJ_LIBXX_FILES := $(APP_LIBXX_FIL
 export PJ_INSTALL_DIR := @prefix@
 export PJ_INSTALL_INC_DIR := @includedir@
 export PJ_INSTALL_LIB_DIR := @libdir@
-export PJ_INSTALL_CFLAGS := -I$(PJ_INSTALL_INC_DIR) -DPJ_AUTOCONF=1 @ac_cflags@
+export PJ_INSTALL_CFLAGS := -DPJ_AUTOCONF=1 @ac_cflags@
 export PJ_INSTALL_LDFLAGS_PRIVATE := $(APP_THIRD_PARTY_LIBS) $(APP_THIRD_PARTY_EXT) @LIBS@
-export PJ_INSTALL_LDFLAGS := -L$(PJ_INSTALL_LIB_DIR) $(filter-out $(PJ_INSTALL_LDFLAGS_PRIVATE),$(APP_LDXXLIBS))
+export PJ_INSTALL_LDFLAGS := $(filter-out $(PJ_INSTALL_LDFLAGS_PRIVATE),$(APP_LDXXLIBS))