diff --git a/configure.ac b/configure.ac
index 0e45289..f941c14 100644
--- a/configure.ac
+++ b/configure.ac
@@ -13,29 +13,21 @@ AC_PATH_PROG(PKG_CONFIG, pkg-config)
 
 # Checks for header files.
 AC_HEADER_STDC
-AC_CHECK_HEADERS([stdio.h stdlib.h stdint.h stddef.h])
+AC_HEADER_STDBOOL
+AC_CHECK_HEADERS([stdio.h stdlib.h stdint.h stddef.h stdbool.h])
 
-
-# libusb
-PKG_CHECK_MODULES(LIBUSB, libusb, [WITH_USB=1], [WITH_USB=0])
-if test "$WITH_USB" == "0" ; then
-  AC_MSG_ERROR([libusb is mandatory.])
-fi
-AC_SUBST(LIBUSB_LIBS)
-AC_SUBST(LIBUSB_CFLAGS)
-
-# libpcsclite
-PKG_CHECK_MODULES(LIBPCSCLITE, libpcsclite, [WITH_PCSC=1], [WITH_PCSC=0])
-if test "$WITH_PCSC" == "0" ; then
-  AC_MSG_ERROR([libpcsclite is mandatory.])
-fi
-AC_SUBST(LIBPCSCLITE_LIBS)
-AC_SUBST(LIBPCSCLITE_CFLAGS)
+# Checks for types
+AC_TYPE_SIZE_T
+AC_TYPE_UINT8_T
+AC_TYPE_UINT16_T
+AC_TYPE_UINT32_T
+AC_TYPE_UINT64_T
+AC_TYPE_INT32_T
 
 # --enable-debug support
 AC_ARG_ENABLE([debug],AS_HELP_STRING([--enable-debug],[Debug flags]),[enable_debug=$enableval],[enable_debug="no"])
  
-AC_MSG_CHECKING(debug)
+AC_MSG_CHECKING(for debug flag)
 AC_MSG_RESULT($enable_debug)
  
 if test "x$enable_debug" = "xyes"
@@ -44,6 +36,24 @@ then
 fi
 AC_SUBST([DEBUG_CFLAGS])
 
+# pkg-config check for
+## libusb
+PKG_CHECK_MODULES(LIBUSB, libusb, [WITH_USB=1], [WITH_USB=0])
+if test "$WITH_USB" == "0" ; then
+  AC_MSG_ERROR([libusb is mandatory.])
+fi
+AC_SUBST(LIBUSB_LIBS)
+AC_SUBST(LIBUSB_CFLAGS)
+
+## libpcsclite
+PKG_CHECK_MODULES(LIBPCSCLITE, libpcsclite, [WITH_PCSC=1], [WITH_PCSC=0])
+if test "$WITH_PCSC" == "0" ; then
+  AC_MSG_ERROR([libpcsclite is mandatory.])
+fi
+AC_SUBST(LIBPCSCLITE_LIBS)
+AC_SUBST(LIBPCSCLITE_CFLAGS)
+
+# Set C standard to C99
 CFLAGS="$CFLAGS -std=c99"
 
 AC_CONFIG_FILES([
diff --git a/src/anticol.c b/src/anticol.c
index 1969dc3..24e1d98 100644
--- a/src/anticol.c
+++ b/src/anticol.c
@@ -22,6 +22,8 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include <stdlib.h>
 #include <stddef.h>
 #include <stdint.h>
+#include <stdbool.h>
+
 #include <string.h>
 
 #include "libnfc.h"
diff --git a/src/dev_acr122.h b/src/dev_acr122.h
index 02e1b50..4771b3e 100644
--- a/src/dev_acr122.h
+++ b/src/dev_acr122.h
@@ -22,6 +22,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define _LIBNFC_DEV_ACR122_H_
 
 #include <stdint.h>
+#include <stdbool.h>
 
 #include "defines.h"
 #include "types.h"
diff --git a/src/dev_pn531.h b/src/dev_pn531.h
index 33ab49e..14dcf4f 100644
--- a/src/dev_pn531.h
+++ b/src/dev_pn531.h
@@ -22,6 +22,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define _LIBNFC_DEV_PN531_H_
 
 #include <stdint.h>
+#include <stdbool.h>
 
 #include "defines.h"
 #include "types.h"
diff --git a/src/libnfc.h b/src/libnfc.h
index 04a50e9..b191908 100644
--- a/src/libnfc.h
+++ b/src/libnfc.h
@@ -22,6 +22,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define _LIBNFC_H_
 
 #include <stdint.h>
+#include <stdbool.h>
 
 #include "defines.h"
 #include "types.h"
diff --git a/src/list.c b/src/list.c
index 742cdc7..4fdd151 100644
--- a/src/list.c
+++ b/src/list.c
@@ -59,7 +59,7 @@ int main(int argc, const char* argv[])
   printf("\nConnected to NFC reader: %s\n\n",pdi->acName);
   
   // Poll for a ISO14443A (MIFARE) tag
-  if (nfc_reader_select(pdi,IM_ISO14443A_106,NULL,NULL,&ti))
+  if (nfc_reader_select(pdi,IM_ISO14443A_106,NULL,0,&ti))
   {
     printf("The following (NFC) ISO14443A tag was found:\n\n");
     printf("    ATQA (SENS_RES): "); print_hex(ti.tia.abtAtqa,2);
@@ -81,14 +81,14 @@ int main(int argc, const char* argv[])
   }
 
   // Poll for a ISO14443B tag
-  if (nfc_reader_select(pdi,IM_ISO14443B_106,NULL,NULL,&ti))
+  if (nfc_reader_select(pdi,IM_ISO14443B_106,NULL,0,&ti))
   {
     // No test results yet
     printf("iso14443b\n");
   }
 
   // Poll for a Jewel tag
-  if (nfc_reader_select(pdi,IM_JEWEL_106,NULL,NULL,&ti))
+  if (nfc_reader_select(pdi,IM_JEWEL_106,NULL,0,&ti))
   {
     // No test results yet
     printf("jewel\n");
diff --git a/src/mftool.c b/src/mftool.c
index c52874d..ec8ff69 100644
--- a/src/mftool.c
+++ b/src/mftool.c
@@ -22,6 +22,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include <stdlib.h>
 #include <stdint.h>
 #include <stddef.h>
+#include <stdbool.h>
 
 #include <string.h>
 #include <ctype.h>
@@ -74,7 +75,7 @@ bool read_card()
       {
         printf("x");
         // When a failure occured we need to redo the anti-collision
-        if (!nfc_reader_select(pdi,IM_ISO14443A_106,NULL,NULL,&ti))
+        if (!nfc_reader_select(pdi,IM_ISO14443A_106,NULL,0,&ti))
         {
           printf("!\nError: tag was removed\n");
           return 1;
@@ -157,7 +158,7 @@ bool write_card()
       {
         printf("x");
         // When a failure occured we need to redo the anti-collision
-        if (!nfc_reader_select(pdi,IM_ISO14443A_106,NULL,NULL,&ti))
+        if (!nfc_reader_select(pdi,IM_ISO14443A_106,NULL,0,&ti))
         {
           printf("!\nError: tag was removed\n");
           return false;
@@ -312,7 +313,7 @@ int main(int argc, const char* argv[])
   printf("Connected to NFC reader: %s\n",pdi->acName);
 
   // Try to find a MIFARE Classic tag
-  if (!nfc_reader_select(pdi,IM_ISO14443A_106,NULL,NULL,&ti))
+  if (!nfc_reader_select(pdi,IM_ISO14443A_106,NULL,0,&ti))
   {
     printf("Error: no tag was found\n");
     nfc_disconnect(pdi);
diff --git a/src/types.h b/src/types.h
index e0b1b28..0b69de5 100644
--- a/src/types.h
+++ b/src/types.h
@@ -22,17 +22,13 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define _LIBNFC_TYPES_H_
 
 #include <stdint.h>
+#include <stdbool.h>
 
 #include "defines.h"
 
 // Compiler directive, set struct alignment to 1 byte for compatibility
 #pragma pack(1)
 
-typedef enum {
-  false = 0x00,
-  true  = 0x01
-} bool;
-
 typedef enum {
   CT_PN531                    = 0x10,
   CT_PN532                    = 0x20,