diff --git a/nxviewer-passwd/libvncauth/Imakefile b/nxviewer-passwd/libvncauth/Imakefile
index f7569b1..f59ff01 100644
--- a/nxviewer-passwd/libvncauth/Imakefile
+++ b/nxviewer-passwd/libvncauth/Imakefile
@@ -3,6 +3,8 @@
 EXTRA_DEFINES = -D__EXTENSIONS__
 #endif
 
+CDEBUGFLAGS += -Wno-error=implicit-function-declaration -fpermissive
+
 SRCS = vncauth.c d3des.c
 
 OBJS = vncauth.o d3des.o
diff --git a/nxviewer-passwd/nxpasswd/Imakefile b/nxviewer-passwd/nxpasswd/Imakefile
index f338030..f200de6 100644
--- a/nxviewer-passwd/nxpasswd/Imakefile
+++ b/nxviewer-passwd/nxpasswd/Imakefile
@@ -3,6 +3,8 @@
 EXTRA_DEFINES = -D__EXTENSIONS__
 #endif
 
+CDEBUGFLAGS += -Wno-error=implicit-function-declaration -fpermissive
+
 SRCS = vncpasswd.c
 INCLUDES = -I../include
 VNCAUTH_LIB = ../libvncauth/libvncauth.a