A file includes/cf/linux.h from dhcp-2.0 is incorrect by falling
flat on an assumption that Linux means 32-bit processor.  This is false
at least on Alpha and UltraSPARC.  In such situations a server resulting
from a source recompilation is broken.

At this moment I worked around the problem by using the following
patch:

--- dhcp-2.0/includes/cf/linux.h~       Thu May 27 11:44:53 1999
+++ dhcp-2.0/includes/cf/linux.h        Mon Dec  6 23:54:19 1999
@@ -41,11 +41,12 @@
 #undef __USE_BSD
 typedef char int8_t;
 typedef short int16_t;
-typedef long int32_t;
+typedef int int32_t;

 typedef unsigned char u_int8_t;
 typedef unsigned short u_int16_t;
-typedef unsigned long u_int32_t;
+typedef unsigned int u_int32_t;
+typedef unsigned long u_int64_t;
 #endif /* __BIT_TYPES_DEFINED__ */

 typedef u_int8_t u8;
@@ -137,3 +138,5 @@

 #define ALIAS_NAMES_PERMUTED
 #define SKIP_DUMMY_INTERFACES
+
+#define PTRSIZE_64BIT

and modifying spec file accorgingly to apply this conditionally
on architecture.  Still this should be really fixed in sources
and the current beta of dhcp-3.0 at ISC is still broken.  This bug
was reported on dhcp-server mailing list.