diff --git a/libtomcrypt.pc.in b/libtomcrypt.pc.in
index f840a545..ebc977d8 100644
--- a/libtomcrypt.pc.in
+++ b/libtomcrypt.pc.in
@@ -1,6 +1,5 @@
 prefix=@CMAKE_INSTALL_PREFIX@
-exec_prefix=${prefix}
-libdir=${exec_prefix}/@CMAKE_INSTALL_LIBDIR@
+libdir=${prefix}/@CMAKE_INSTALL_LIBDIR@
 includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@/@PROJECT_NAME@
 
 Name: LibTomCrypt
diff --git a/makefile.shared b/makefile.shared
index 2ac1e78a..310840c9 100644
--- a/makefile.shared
+++ b/makefile.shared
@@ -93,8 +93,8 @@ endef
 $(foreach demo, $(strip $(DEMOS)), $(eval $(call DEMO_template,$(demo))))
 
 install: $(call print-help,install,Installs the library + headers + pkg-config file) .common_install
-	sed -e 's,^prefix=.*,prefix=$(PREFIX),' -e 's,^Version:.*,Version: $(VERSION_PC),' -e 's,@CMAKE_INSTALL_LIBDIR@,lib,' \
-		-e 's,@CMAKE_INSTALL_INCLUDEDIR@/@PROJECT_NAME@,include/tomcrypt,' \
+	sed -e 's,^prefix=.*,prefix=$(PREFIX),' -e 's,^Version:.*,Version: $(VERSION_PC),' -e 's,^libdir=.*,libdir=$(LIBPATH),' \
+		-e 's,^includedir=.*,includedir=$(INCPATH),' \
 		-e 's,@MPI_PROVIDERS_LIBS@,$(LTC_MPI_PROVIDERS_LIBS),' \
 		-e 's,@MPI_PROVIDERS_CFLAGS@,$(LTC_MPI_PROVIDERS_CFLAGS),' libtomcrypt.pc.in > libtomcrypt.pc
 	install -p -d $(DESTDIR)$(LIBPATH)/pkgconfig
diff --git a/makefile.unix b/makefile.unix
index 31473a07..a46736c2 100644
--- a/makefile.unix
+++ b/makefile.unix
@@ -35,11 +35,15 @@ ARFLAGS   = r
 RANLIB    = ranlib
 CFLAGS    = -O2 -DUSE_LTM -DLTM_DESC -I../libtommath
 EXTRALIBS = ../libtommath/libtommath.a
+# pkg-config flags, added to libtomcrypt.pc on install time
+PC_CFLAGS = -DLTM_DESC
+PC_LIBS   = -ltommath
 
 #Compilation flags
 LTC_CFLAGS  = -Isrc/headers -Itests -DLTC_SOURCE $(CFLAGS)
 LTC_LDFLAGS = $(LDFLAGS) $(EXTRALIBS)
 VERSION=1.18.2-develop
+VERSION_PC=1.18.2
 
 #Libraries to be created (this makefile builds only static libraries)
 LIBMAIN_S =libtomcrypt.a
@@ -320,7 +324,10 @@ install: $(LIBMAIN_S)
 	@mkdir -p $(DESTDIR)$(INCPATH) $(DESTDIR)$(LIBPATH)/pkgconfig
 	@cp $(LIBMAIN_S) $(DESTDIR)$(LIBPATH)/
 	@cp $(HEADERS_PUB) $(DESTDIR)$(INCPATH)/
-	@sed -e 's,^prefix=.*,prefix=$(PREFIX),' -e 's,^Version:.*,Version: $(VERSION),' libtomcrypt.pc.in > $(DESTDIR)$(LIBPATH)/pkgconfig/libtomcrypt.pc
+	@sed -e 's,^prefix=.*,prefix=$(PREFIX),' -e 's,^Version:.*,Version: $(VERSION_PC),' -e 's,^libdir=.*,libdir=$(LIBPATH),' \
+		-e 's,^includedir=.*,includedir=$(INCPATH),' \
+		-e 's,@MPI_PROVIDERS_LIBS@,$(PC_LIBS),' \
+		-e 's,@MPI_PROVIDERS_CFLAGS@,$(PC_CFLAGS),' libtomcrypt.pc.in > $(DESTDIR)$(LIBPATH)/pkgconfig/libtomcrypt.pc
 
 #Install useful tools
 install_bins: hashsum
diff --git a/makefile_include.mk b/makefile_include.mk
index 22f3fb1c..f933b36b 100644
--- a/makefile_include.mk
+++ b/makefile_include.mk
@@ -190,7 +190,7 @@ DEMOS          = $(UNBROKEN_DEMOS) $(BROKEN_DEMOS)
 DESTDIR  ?=
 PREFIX   ?= /usr/local
 LIBPATH  ?= $(PREFIX)/lib
-INCPATH  ?= $(PREFIX)/include
+INCPATH  ?= $(PREFIX)/include/libtomcrypt
 DATAPATH ?= $(PREFIX)/share/doc/libtomcrypt/pdf
 BINPATH  ?= $(PREFIX)/bin