diff --git a/Makefile b/Makefile
index 6c673f5..e0bc81e 100644
--- a/Makefile
+++ b/Makefile
@@ -2,13 +2,10 @@
 all: luksrku luksrku-config
 
 INSTALL_PREFIX := /usr/local/
-OPENSSL_DIR := `pwd`/openssl-1.1.0e/
-#OPENSSL_DIR := /home/joe/openssl/
-#LIBDIR := /usr/lib/x86_64-linux-gnu/
-LIBDIR := $(OPENSSL_DIR)
-CFLAGS := -std=c11 -Wall -Wextra -O2 -pthread -D_POSIX_SOURCE -D_XOPEN_SOURCE=500 -Wmissing-prototypes -Wstrict-prototypes -Wno-unused-parameter -I$(OPENSSL_DIR)include
+CFLAGS := -std=c11 -Wall -Wextra -O2 -pthread -D_POSIX_SOURCE -D_XOPEN_SOURCE=500 -Wmissing-prototypes -Wstrict-prototypes -Wno-unused-parameter
 #CFLAGS += -g -DDEBUG
-LDFLAGS := -L$(OPENSSL_DIR) -lcrypto -lssl 
+LDFLAGS := -lcrypto -lssl
+LDFLAGS += -L/usr/local/lib
 #LDFLAGS := -static $(LIBDIR)libssl.a $(LIBDIR)libcrypto.a
 #LDFLAGS := -static $(LIBDIR)libssl.a $(LIBDIR)libcrypto.a -ldl
 
@@ -20,24 +17,21 @@ install: all
 	cp luksrku luksrku-config $(INSTALL_PREFIX)sbin/
 	chown root:root $(INSTALL_PREFIX)sbin/luksrku $(INSTALL_PREFIX)sbin/luksrku-config
 	chmod 755 $(INSTALL_PREFIX)sbin/luksrku $(INSTALL_PREFIX)sbin/luksrku-config
-	cp -a $(OPENSSL_DIR)libssl* $(OPENSSL_DIR)libcrypto* $(INSTALL_PREFIX)lib/
-	ldconfig
 
 clean:
 	rm -f $(OBJS) $(OBJS_CFG) luksrku luksrku-config
 
 valgrind: luksrku
-	LD_LIBRARY_PATH=$(OPENSSL_DIR) valgrind --leak-check=full --show-leak-kinds=all ./luksrku -v --client-mode -k client_keys.bin
-#LD_LIBRARY_PATH=$(OPENSSL_DIR) valgrind --leak-check=full --show-leak-kinds=all ./luksrku -v --server-mode -k server_key.bin
+	valgrind --leak-check=full --show-leak-kinds=all ./luksrku -v --client-mode -k client_keys.bin
 
 test: luksrku
-	LD_LIBRARY_PATH=$(OPENSSL_DIR) ./luksrku -v --server-mode -k server_key.bin
+	./luksrku -v --server-mode -k server_key.bin
 
 gdb: luksrku
-	LD_LIBRARY_PATH=$(OPENSSL_DIR) gdb --args ./luksrku -v --server-mode -k server_key.bin
+	gdb --args ./luksrku -v --server-mode -k server_key.bin
 
 testclient: luksrku
-	LD_LIBRARY_PATH=$(OPENSSL_DIR) ./luksrku -v --client-mode -k client_keys.bin
+	./luksrku -v --client-mode -k client_keys.bin
 
 derive: luksrku-config
 	./luksrku-config server server_key.txt server_key.bin
diff --git a/build_openssl b/build_openssl
deleted file mode 100755
index 5d298d8..0000000
--- a/build_openssl
+++ /dev/null
@@ -1,19 +0,0 @@
-#!/bin/bash
-#
-#
-
-VERSION="1.1.0e"
-URL="https://www.openssl.org/source/openssl-${VERSION}.tar.gz"
-LOCAL_TARGZ="openssl-${VERSION}.tar.gz"
-LOCAL_DIR="openssl-${VERSION}"
-
-if [ ! -f "$LOCAL_TARGZ" ]; then
-	wget "$URL"
-fi
-
-if [ ! -d "$LOCAL_DIR" ]; then
-	tar xfz "$LOCAL_TARGZ"
-	cd "$LOCAL_DIR"
-	./config
-	make -j 16
-fi
diff --git a/luksrku.c b/luksrku.c
index b643f3e..12da48c 100644
--- a/luksrku.c
+++ b/luksrku.c
@@ -33,6 +33,10 @@
 #include "log.h"
 #include "keyfile.h"
 
+#if OPENSSL_VERSION_NUMBER < 0x010100000
+#error "luksrku requires at least OpenSSL v1.1 to work."
+#endif
+
 int main(int argc, char **argv) {
 #ifdef DEBUG
 	fprintf(stderr, "WARNING: This has been compiled in DEBUG mode and uses reduced security.\n");
@@ -66,7 +70,7 @@ int main(int argc, char **argv) {
 #ifdef DEBUG
 		keydb_dump(&keydb);
 #endif
-		
+
 		if (keydb.entrycnt == 0) {
 			log_msg(LLVL_FATAL, "Key database file %s contains no keys.", options.keydbfile);
 			success = false;
@@ -79,13 +83,13 @@ int main(int argc, char **argv) {
 				success = false;
 				break;
 			}
-			
+
 			if (keydb_disk_key_count(&keydb) != 0) {
 				log_msg(LLVL_FATAL, "Server configuration files may not contain disk unlocking keys.");
 				success = false;
 				break;
 			}
-			
+
 			if (!dtls_server(keydb_getentry(&keydb, 0), &options)) {
 				log_msg(LLVL_FATAL, "Failed to start DTLS server.");
 				success = false;
@@ -99,7 +103,7 @@ int main(int argc, char **argv) {
 			}
 		}
 	} while (false);
-	
+
 	keydb_free(&keydb);
 	if (!success) {
 		exit(EXIT_FAILURE);