Add a proper build system.

configure.ac

@@ -0,0 +1,63 @@
+AC_INIT(ObjOpenSSL, 0.1, js@webkeks.org)
+AC_CONFIG_SRCDIR(src)
+
+AC_CHECK_TOOL(OBJFW_CONFIG, objfw-config)
+AS_IF([test x"$OBJFW_CONFIG" = x""], [
+       AC_MSG_ERROR(You need ObjFW and objfw-config installed!)
+])
+
+test x"$OBJC" = x"" && OBJC="$($OBJFW_CONFIG --objc)"
+
+AC_LANG([Objective C])
+AC_PROG_OBJC
+AC_PROG_OBJCPP
+AC_PROG_LN_S
+AC_PROG_INSTALL
+
+CPP="$OBJCPP"
+CPPFLAGS="$CPPFLAGS $OBJCPPFLAGS $($OBJFW_CONFIG --cppflags)"
+OBJCFLAGS="$OBJCFLAGS -Wall $($OBJFW_CONFIG --objcflags)"
+LDFLAGS="$LDFLAGS $($OBJFW_CONFIG --ldflags)"
+LIBS="$LIBS $($OBJFW_CONFIG --libs)"
+
+AC_ARG_ENABLE(shared,
+	AS_HELP_STRING([--disable-shared], [do not build shared library]))
+AS_IF([test x"$enable_shared" != x"no"], [
+	BUILDSYS_SHARED_LIB
+	AC_SUBST(OBJOPENSSL_SHARED_LIB, "${LIB_PREFIX}objopenssl${LIB_SUFFIX}")
+])
+AC_ARG_ENABLE(static, AS_HELP_STRING([--enable-static], [build static library]))
+AS_IF([test x"$enable_static" = x"yes" -o x"$enable_shared" = x"no"], [
+	AC_PATH_TOOL(AR, ar)
+	AC_PROG_RANLIB
+	AC_SUBST(OBJOPENSSL_STATIC_LIB, "libobjopenssl.a")
+])
+
+AC_CHECK_LIB(ssl, main, [LIBS="$LIBS -lssl"], [
+	AC_MSG_ERROR(No libssl found! Please install OpenSSL!)
+])
+AC_CHECK_LIB(crypto, main, [LIBS="$LIBS -lcrypto"], [
+	AC_MSG_ERROR(No libcrypto found! Please install OpenSSL!)
+])
+AC_CHECK_LIB(z, main, [LIBS="$LIBS -lz"], [
+	AC_MSG_ERROR(No libz found! Please install zlib!)
+])
+
+AS_IF([test x"$GOBJC" = x"yes"], [
+	OBJCFLAGS="$OBJCFLAGS -Wwrite-strings -Wcast-align -Wpointer-arith"
+	dnl We need -Wno-deprecated-declarations as OpenSSL is deprecated on
+	dnl OS X.
+	OBJCFLAGS="$OBJCFLAGS -Wno-deprecated-declarations -Werror"
+])
+
+BUILDSYS_INIT
+BUILDSYS_TOUCH_DEPS
+
+dnl We don't call AC_PROG_CPP, but only AC_PROG_OBJCPP and set CPP to OBJCPP
+dnl and add OBJCPPFLAGS to CPPFLAGS, thus we need to AC_SUBST these ourself.
+AC_SUBST(CPP)
+AC_SUBST(CPPFLAGS)
+
+AC_SUBST(PACKAGE, ObjOpenSSL)
+AC_CONFIG_FILES([buildsys.mk extra.mk])
+AC_OUTPUT