C11 checks

configure.ac

@@ -7,14 +7,27 @@ AM_INIT_AUTOMAKE
 AC_CONFIG_SRCDIR([src/main.c])
 AC_CONFIG_HEADERS([config.h])
 
+AC_LANG([C]) # Use C not C++
+
 # Checks for programs.
 AC_PROG_CC
+
+# In case that you want to check for specific versions of gcc 
+# For example in case that you need C11 support you want to 
+# check for gcc-4.9 
+#AC_PROG_CC([gcc-4.9 gcc cc])
+
 AC_PROG_INSTALL
 
 # Checks for libraries.
 
 # Checks for header files.
-AC_CHECK_HEADERS([stdlib.h])
+AC_CHECK_HEADER([stdlib.h])
+
+# Check for C11's optional Atomic operations library 
+# AC_CHECK_HEADER([stdatomic.h], [], [
+#                 AC_MSG_ERROR([C11 with atomic support needed.])
+#                  ])
 
 # Checks for typedefs, structures, and compiler characteristics.
 

src/Makefile.am

@@ -1,2 +1,3 @@
 bin_PROGRAMS = myexecutable
 myexecutable_SOURCES = main.c
+myexecutable_CFLAGS = #--std=c11 # CFLAGS applicable to myexecutable_SOURCES