diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..ae69e70
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,15 @@
+language: cpp
+compiler:
+  - clang
+  - gcc
+addons:
+  apt:
+    sources:
+    - ubuntu-toolchain-r-test
+    packages:
+    - gcc-4.8
+    - g++-4.8
+    - clang
+install:
+  - if [ "$CXX" = "g++" ]; then export CXX="g++-4.8" CC="gcc-4.8"; fi
+script: ./autobuild
diff --git a/autobuild b/autobuild
index 35236a0..cc7467b 100755
--- a/autobuild
+++ b/autobuild
@@ -3,4 +3,5 @@
 CXX=g++
 command -v clang 2>&1 > /dev/null && CXX=clang++
 [ -d m4 ] || mkdir m4
-autoreconf -i && ./configure CXX=$CXX && make && make check
+autoreconf -i && ./configure --enable-silent-rules CXX=$CXX 	\
+	&& make && make check
diff --git a/configure.ac b/configure.ac
index 7b2b651..9a1a89f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,10 +1,10 @@
-AC_PREREQ([2.69])
+AC_PREREQ([2.68])
 AC_INIT([libemsha],
 	[1.0.0-RC1],
 	[coder@kyleisom.net],
 	[libemsha],
 	[https://kyleisom.net/projects/libemsha/])
-AM_INIT_AUTOMAKE([1.14 foreign])
+AM_INIT_AUTOMAKE([1.11 foreign])
 
 AC_CONFIG_SRCDIR([src/emsha/sha256.hh])
 AC_CONFIG_FILES([Makefile src/Makefile doc/Makefile doc/sphinx/source/conf.py])
diff --git a/src/test_emsha.cc b/src/test_emsha.cc
index 2e68063..81cb90e 100644
--- a/src/test_emsha.cc
+++ b/src/test_emsha.cc
@@ -78,10 +78,13 @@ hash_equal_test(void)
 	}
 
 	if (!(emsha::hash_equal(a, b))) {
+		string	s;
 		cerr << "FAILED: hash_equal\n";
 		cerr << "\thash_equal should have succeeded comparing a and b.\n";
-		cerr << "\ta <- " << dump_hexstring(a, emsha::SHA256_HASH_SIZE) << std::endl;
-		cerr << "\tb <- " << dump_hexstring(b, emsha::SHA256_HASH_SIZE) << std::endl;
+		dump_hexstring(s, a, emsha::SHA256_HASH_SIZE);
+		cerr << "\ta <- " << s << std::endl;
+		dump_hexstring(s, b, emsha::SHA256_HASH_SIZE);
+		cerr << "\tb <- " << s << std::endl;
 		exit(1);
 	}
 
@@ -91,10 +94,13 @@ hash_equal_test(void)
 	}
 
 	if (emsha::hash_equal(a, b)) {
+		string	s;
 		cerr << "FAILED: hash_equal\n";
 		cerr << "\thash_equal should not have succeeded comparing a and b.\n";
-		cerr << "\ta <- " << dump_hexstring(a, emsha::SHA256_HASH_SIZE) << std::endl;
-		cerr << "\tb <- " << dump_hexstring(b, emsha::SHA256_HASH_SIZE) << std::endl;
+		dump_hexstring(s, a, emsha::SHA256_HASH_SIZE);
+		cerr << "\ta <- " << s << std::endl;
+		dump_hexstring(s, b, emsha::SHA256_HASH_SIZE);
+		cerr << "\tb <- " << s << std::endl;
 		exit(1);
 	}
 
diff --git a/src/test_utils.cc b/src/test_utils.cc
index e5631bd..8c2b55b 100644
--- a/src/test_utils.cc
+++ b/src/test_utils.cc
@@ -38,18 +38,18 @@ using std::cerr;
 using std::endl;
 
 
-string
-dump_hexstring(uint8_t *s, uint32_t sl)
+void
+dump_hexstring(string& hs, uint8_t *s, uint32_t sl)
 {
 	uint32_t	 bl = (2 * sl) + 1;
 	char		*buf = new char[bl];
-	string		 hs;
+	string		 tmp;
 
 	memset(buf, 0, bl);
 	emsha::hexstring((uint8_t *)buf, s, sl);
-	hs = string(buf);
+	tmp = string(buf);
+	hs.swap(tmp);
 	delete[] buf;
-	return hs;
 }
 
 
@@ -72,7 +72,7 @@ run_hmac_test(struct hmac_test test, string label)
 			goto exit;
 		}
 
-		hs = dump_hexstring(dig, emsha::SHA256_HASH_SIZE);
+		dump_hexstring(hs, dig, emsha::SHA256_HASH_SIZE);
 		if (hs != test.output) {
 			res = emsha::EMSHA_TEST_FAILURE;
 			goto exit;
@@ -94,7 +94,7 @@ run_hmac_test(struct hmac_test test, string label)
 			goto exit;
 		}
 
-		hs = dump_hexstring(dig, emsha::SHA256_HASH_SIZE);
+		dump_hexstring(hs, dig, emsha::SHA256_HASH_SIZE);
 		if (hs != test.output) {
 			res = emsha::EMSHA_TEST_FAILURE;
 			goto exit;
@@ -111,7 +111,7 @@ run_hmac_test(struct hmac_test test, string label)
 		goto exit;
 	}
 
-	hs = dump_hexstring(dig, emsha::SHA256_HASH_SIZE);
+	dump_hexstring(hs, dig, emsha::SHA256_HASH_SIZE);
 	if (hs != test.output) {
 		cerr << "(comparing single pass function output)\n";
 		res = emsha::EMSHA_TEST_FAILURE;
@@ -165,7 +165,7 @@ run_hash_test(struct hash_test test, string label)
 			goto exit;
 		}
 
-		hs = dump_hexstring(dig, emsha::SHA256_HASH_SIZE);
+		dump_hexstring(hs, dig, emsha::SHA256_HASH_SIZE);
 		if (hs != test.output) {
 			res = emsha::EMSHA_TEST_FAILURE;
 			goto exit;
@@ -187,7 +187,7 @@ run_hash_test(struct hash_test test, string label)
 			goto exit;
 		}
 
-		hs = dump_hexstring(dig, emsha::SHA256_HASH_SIZE);
+		dump_hexstring(hs, dig, emsha::SHA256_HASH_SIZE);
 		if (hs != test.output) {
 			res = emsha::EMSHA_TEST_FAILURE;
 			goto exit;
@@ -203,7 +203,7 @@ run_hash_test(struct hash_test test, string label)
 		goto exit;
 	}
 
-	hs = dump_hexstring(dig, emsha::SHA256_HASH_SIZE);
+	dump_hexstring(hs, dig, emsha::SHA256_HASH_SIZE);
 	if (hs != test.output) {
 		cerr << "(comparing single pass function output)\n";
 		res = emsha::EMSHA_TEST_FAILURE;
diff --git a/src/test_utils.hh b/src/test_utils.hh
index df8bdfc..5719ea6 100644
--- a/src/test_utils.hh
+++ b/src/test_utils.hh
@@ -59,8 +59,8 @@ struct hmac_test {
 
 
 // General-purpose debuggery.
-std::string	dump_hexstring(std::uint8_t *, std::uint32_t);
-void		dump_pair(std::uint8_t *, std::uint8_t *);
+void	dump_hexstring(std::string&, std::uint8_t *, std::uint32_t);
+void	dump_pair(std::uint8_t *, std::uint8_t *);
 
 
 // SHA-256 testing functions.