diff --git a/README b/README
index 3082f71..0150e90 100644
--- a/README
+++ b/README
@@ -68,7 +68,7 @@
 To compile on NetBSD or DragonFly BSD, use:
 
  ln -s /usr/pkg/include/pciutils pci
- gmake CFLAGS=-I. LDFLAGS="-L/usr/pkg/lib -Wl,-rpath-link,/usr/pkg/lib"
+ gmake CPPFLAGS=-I. LDFLAGS="-L/usr/pkg/lib -Wl,-rpath-link,/usr/pkg/lib"
 
 To compile and run on Darwin/Mac OS X:
 
diff --git a/dummyflasher.c b/dummyflasher.c
index 0f62d16..8ebd695 100644
--- a/dummyflasher.c
+++ b/dummyflasher.c
@@ -38,7 +38,8 @@
 		programmer_param = strdup("parallel,lpc,fwh,spi");
 	/* Convert the parameters to lowercase. */
 	for (i = 0; programmer_param[i] != '\0'; i++)
-		programmer_param[i] = (char)tolower(programmer_param[i]);
+		programmer_param[i] =
+		    (char)tolower((unsigned char)programmer_param[i]);
 
 	buses_supported = CHIP_BUSTYPE_NONE;
 	if (strstr(programmer_param, "parallel")) {