diff --git a/include/nlm/.Sanitize b/include/nlm/.Sanitize
index ca9364696f..2555488f08 100644
--- a/include/nlm/.Sanitize
+++ b/include/nlm/.Sanitize
@@ -30,6 +30,8 @@ ChangeLog
 common.h
 external.h
 internal.h
+i386-ext.h
+sparc32-ext.h
 
 Things-to-lose:
 
diff --git a/include/nlm/i386-ext.h b/include/nlm/i386-ext.h
new file mode 100644
index 0000000000..9c498378cd
--- /dev/null
+++ b/include/nlm/i386-ext.h
@@ -0,0 +1,96 @@
+typedef struct nlm32_i386_external_fixed_header
+{
+
+  /* The signature field identifies the file as an NLM.  It must contain
+     the signature string, which depends upon the NLM target. */
+
+  unsigned char signature[24];
+
+  /* The version of the header.  At this time, the highest version number
+     is 4. */
+
+  unsigned char version[4];
+
+  /* The name of the module, which must be a DOS name (1-8 characters followed
+     by a period and a 1-3 character extension).  The first byte is the byte
+     length of the name and the last byte is a null terminator byte.  This
+     field is fixed length, and any unused bytes should be null bytes.  The
+     value is set by the OUTPUT keyword to NLMLINK. */
+
+  unsigned char moduleName[14];
+
+  /* The byte offset of the code image from the start of the file. */
+
+  unsigned char codeImageOffset[4];
+
+  /* The size of the code image, in bytes. */
+
+  unsigned char codeImageSize[4];
+
+  /* The byte offset of the data image from the start of the file. */
+
+  unsigned char dataImageOffset[4];
+
+  /* The size of the data image, in bytes. */
+
+  unsigned char dataImageSize[4];
+
+  /* The size of the uninitialized data region that the loader is to be
+     allocated at load time.  Uninitialized data follows the initialized
+     data in the NLM address space. */
+
+  unsigned char uninitializedDataSize[4];
+
+  /* The byte offset of the custom data from the start of the file.  The
+     custom data is set by the CUSTOM keyword to NLMLINK.  It is possible
+     for this to be EOF if there is no custom data. */
+
+  unsigned char customDataOffset[4];
+
+  /* The size of the custom data, in bytes. */
+
+  unsigned char customDataSize[4];
+
+  /* The byte offset of the module dependencies from the start of the file.
+     The module dependencies are determined by the MODULE keyword in
+     NLMLINK. */
+
+  unsigned char moduleDependencyOffset[4];
+
+  /* The number of module dependencies at the moduleDependencyOffset. */
+
+  unsigned char numberOfModuleDependencies[4];
+
+  /* The byte offset of the relocation fixup data from the start of the file */
+     
+  unsigned char relocationFixupOffset[4];
+
+  unsigned char numberOfRelocationFixups[4];
+
+  unsigned char externalReferencesOffset[4];
+
+  unsigned char numberOfExternalReferences[4];
+
+  unsigned char publicsOffset[4];
+
+  unsigned char numberOfPublics[4];
+
+  /* The byte offset of the internal debug info from the start of the file.
+     It is possible for this to be EOF if there is no debug info. */
+
+  unsigned char debugInfoOffset[4];
+
+  unsigned char numberOfDebugRecords[4];
+
+  unsigned char codeStartOffset[4];
+
+  unsigned char exitProcedureOffset[4];
+
+  unsigned char checkUnloadProcedureOffset[4];
+
+  unsigned char moduleType[4];
+
+  unsigned char flags[4];
+
+} Nlm32_i386_External_Fixed_Header;
+
diff --git a/include/nlm/sparc32-ext.h b/include/nlm/sparc32-ext.h
new file mode 100644
index 0000000000..8548c65698
--- /dev/null
+++ b/include/nlm/sparc32-ext.h
@@ -0,0 +1,100 @@
+typedef struct nlm32_sparc_external_fixed_header
+{
+
+  /* The signature field identifies the file as an NLM.  It must contain
+     the signature string, which depends upon the NLM target. */
+
+  unsigned char signature[24];
+
+  /* The version of the header.  At this time, the highest version number
+     is 4. */
+
+  unsigned char version[4];
+
+  /* The name of the module, which must be a DOS name (1-8 characters followed
+     by a period and a 1-3 character extension).  The first byte is the byte
+     length of the name and the last byte is a null terminator byte.  This
+     field is fixed length, and any unused bytes should be null bytes.  The
+     value is set by the OUTPUT keyword to NLMLINK. */
+
+  unsigned char moduleName[14];
+
+  /* Padding to make it come out correct. */
+
+  unsigned char pad1[2];
+
+  /* The byte offset of the code image from the start of the file. */
+
+  unsigned char codeImageOffset[4];
+
+  /* The size of the code image, in bytes. */
+
+  unsigned char codeImageSize[4];
+
+  /* The byte offset of the data image from the start of the file. */
+
+  unsigned char dataImageOffset[4];
+
+  /* The size of the data image, in bytes. */
+
+  unsigned char dataImageSize[4];
+
+  /* The size of the uninitialized data region that the loader is to be
+     allocated at load time.  Uninitialized data follows the initialized
+     data in the NLM address space. */
+
+  unsigned char uninitializedDataSize[4];
+
+  /* The byte offset of the custom data from the start of the file.  The
+     custom data is set by the CUSTOM keyword to NLMLINK.  It is possible
+     for this to be EOF if there is no custom data. */
+
+  unsigned char customDataOffset[4];
+
+  /* The size of the custom data, in bytes. */
+
+  unsigned char customDataSize[4];
+
+  /* The byte offset of the module dependencies from the start of the file.
+     The module dependencies are determined by the MODULE keyword in
+     NLMLINK. */
+
+  unsigned char moduleDependencyOffset[4];
+
+  /* The number of module dependencies at the moduleDependencyOffset. */
+
+  unsigned char numberOfModuleDependencies[4];
+
+  /* The byte offset of the relocation fixup data from the start of the file */
+     
+  unsigned char relocationFixupOffset[4];
+
+  unsigned char numberOfRelocationFixups[4];
+
+  unsigned char externalReferencesOffset[4];
+
+  unsigned char numberOfExternalReferences[4];
+
+  unsigned char publicsOffset[4];
+
+  unsigned char numberOfPublics[4];
+
+  /* The byte offset of the internal debug info from the start of the file.
+     It is possible for this to be EOF if there is no debug info. */
+
+  unsigned char debugInfoOffset[4];
+
+  unsigned char numberOfDebugRecords[4];
+
+  unsigned char codeStartOffset[4];
+
+  unsigned char exitProcedureOffset[4];
+
+  unsigned char checkUnloadProcedureOffset[4];
+
+  unsigned char moduleType[4];
+
+  unsigned char flags[4];
+
+} Nlm32_sparc_External_Fixed_Header;
+