Use c99 standard and DREENTRANT for thread save libc

configure.ac

@@ -57,6 +57,9 @@ AM_CFLAGS="${AM_CFLAGS} ${MEM_OPT_FLAGS}"
 AM_CFLAGS="${AM_CFLAGS} ${CFLAGS}"
 AC_SUBST(AM_CFLAGS)
 
+AM_LDFLAGS=""
+AC_SUBST(AM_LDFLAGS)
+
 AC_CONFIG_FILES([Makefile
 		 docs/Makefile
 		 tests/Makefile

src/Makefile.am

@@ -1,7 +1,8 @@
 ACLOCAL_AMFLAGS = -I m4
 AUTOMAKE_OPTIONS = subdir-objects
 
-AM_CFLAGS += -I../include/
+AM_CFLAGS += -I../include/ -std=c99 -DREENTRANT -lpthread
+AM_LDFLAGS += -lpthread
 
 TR_HASH = hexdecode.c \
 	  hexencode.c \
@@ -23,13 +24,15 @@ bin_PROGRAMS = trsha1speed trencodespeed
 
 libtrhashing_la_SOURCES = $(TR_HASH)
 libtrhashing_la_CFLAGS  = $(AM_CFLAGS) -std=c99 $(OPENSSL)
-libtrhashing_la_LIBADD  =
-libtrhashing_la_LDFLAGS = -version-info 0:0:0
+libtrhashing_la_LIBADD  = 
+libtrhashing_la_LDFLAGS = -version-info 0:0:0 $(AM_LDFLAGS)
 
 trsha1speed_SOURCES = sha1speed.c
 trsha1speed_CFLAGS  = $(AM_CFLAGS) $(OPENSSL)
 trsha1speed_LDADD   = -ltrhashing -ltrbase -lcrypto -luuid
+trsha1speed_LDFLAGS = $(AM_LDFLAGS)
 
 trencodespeed_SOURCES = encodespeed.c
 trencodespeed_CFLAGS  = $(AM_CFLAGS)
 trencodespeed_LDADD   = -ltrhashing -ltrbase -lcrypto -luuid
+trencodespeed_LDFLAGS = $(AM_LDFLAGS)