Add headers and fix build

Add more C headers and allow libsb to build correctly with warnings.

configure.ac

@@ -1,13 +1,13 @@
 # Title, version, etc.
 AC_INIT(\
-        [RTR], \
+        [SB0], \
         [0.1.0], \
         [mail@acm.contact], \
-        [rtr], \
+        [sb0], \
         [https://www.delay.cloud/] \
         )
 
-AC_COPYRIGHT(ISC License)
+AC_COPYRIGHT(All rights reserved.)
 
 # AC_CHECK_LIB is not utilized, since it checks the presence of libraries by
 # linking them to test program; this process introduces more overhead and longer
@@ -57,16 +57,25 @@ AC_CONFIG_FILES([\
 AC_CONFIG_SRCDIR([src/main.c])
 
 
-CFLAGS="$CFLAGS -std=c99 -pedantic-errors -Wall -Wold-style-definition -Wextra \
-        -Wmissing-prototypes -Wstrict-prototypes" # Compile to C11
+CFLAGS="$CFLAGS -std=c89 -pedantic-errors -Wall -Wold-style-definition -Wextra \
+        -Wmissing-prototypes -Wstrict-prototypes" # Compile to C89
                                                   # without
                                                   # GNU extensions.
                                                   # Warnings on.
 
+# Change -std=c++98 to -std=c++11.
+
+CXXFLAGS="$CFLAGS -std=c++98 -pedantic-errors -Wall -Wold-style-definition \
+        -Wextra -Wmissing-prototypes -Wstrict-prototypes" # Compile to C++98
+                                                          # without
+                                                          # GNU extensions.
+                                                          # Warnings on.
+
 LT_INIT([shared disable-static]) # Start GNU Libtool. Satic libraries
                                  # disabled; shared/dynamic linking.
 
 AC_PROG_CC([gcc]) # Autoconf for C compiler; obviously set to use GCC.
+AC_PROG_CXX([g++])
 
 AC_OUTPUT # Generate files.