--- a/configure.ac
+++ b/configure.ac
@@ -2,6 +2,7 @@
 AC_INIT([sarg],[2.3.9])
 AC_CONFIG_SRCDIR([log.c])
 AC_CONFIG_AUX_DIR(cfgaux)
+AC_CONFIG_MACRO_DIR(m4)
 
 AC_CANONICAL_HOST
 
@@ -26,6 +27,11 @@
 dnl C99 support is required to define LLONG_MAX (at least on CentOS 5.7)
 AC_PROG_CC_C99
 
+dnl mkdir_p / MKDIR_P
+AC_PROG_MKDIR_P
+mkdir_p="$MKDIR_P"
+AC_SUBST(mkdir_p)
+
 # Report more warnings to improve code quality.
 CFLAGS="${CFLAGS} -Wall -Wno-sign-compare"
 
@@ -60,7 +66,7 @@
 
 case "$host" in
    *-solaris*)
-   LDFLAGS="${LDFLAGS} -lsocket -lnsl"
+   LIBS="${LIBS} -lsocket -lnsl"
    CFLAGS="-DSOLARIS ${CFLAGS}"
    ;;
 esac