You can be pretty sure that no existing PHIGS program will compile, link 
and run.  They'll all need conversion.

There are six sed scripts in this directory.  They are named
todis[1-6].sed.  While these sed files work and contain most of the
changes, they were mainly written for conversion of the API code itself.
Some things need to be done by hand.  There's no money-back guarantee,
The script todis.sh can be run to process a file through the
sed scripts. You might need to set the progpath in this script
before running. 

Attached below are some notes made during the conversion.  They
list some things that need to be done by hand (given the current sed
scripts) and a number of PHIGS PLUS changes documented nowhere else.  
There are a number of changes to the PHIGS PLUS part of the binding, 
most of them for consistency with the DIS binding ("index" has to be 
"ind" everywhere).  Few functions had parameter changes, although some 
of the ones that did are high-use types (ppolyline3 and friends).  
The sed scripts attempt to warn about these.

-------------------------------NOTES---------------------------------
* Enumeration name changes
    sed script
* #define changes
    sed script
* Function name changes
    sed script
* Data structure name changes
    sed script
* Data structure field name changes
    sed script and diff check
* PHIGS PLUS function name changes
    sed script
* New error numbers
    sed script
* New function names in phigscfunc.h
    by hand
* Data structure changes
    by hand
* New stuff
    by hand
* Function parameter changes
    by hand
* Set Error Handling
    by hand
* Removed stuff
    by hand
Check all enumerations
    by hand
Make all the vertex and facet data flags enumerations
    by hand

Data type field name changes, by hand
--------------------------------------
Ploc_data.ln --> line_attrs     (sed script change and warning)
Ploc_data3.ln --> line_attrs    (sed script change and warning)
Pedge_attrs.index --> ind       (sed script change and warning)
Pint_attrs.index --> ind        (sed script change and warning)
Pline_attrs.index --> ind       (sed script change and warning)
Pmarker_attrs.index --> ind     (sed script change and warning)
Pedge_bundle.colr --> colr_ind
Pline_bundle.colr --> colr_ind
Pmarker_bundle.colr --> colr_ind
Ptext_bundle.colr --> colr_ind
Pint_bundle.colr --> colr_ind
Ppat_rep.dim --> dims
Ppat_rep_plus.dim --> dims
Pint_facs.int_styles is now a fixed size array
Pcolr_rep changed considerably
Pelem_data.nurb_surf.order --> u_order and v_order
pcreate_store() loses first parameter

Notes
-----
Pflush_class went away, replaced by Pin_class.
Ppres_inval went away.
Pstore_type went away.
Pint_point went away.
Pint_point3 went away.
Pwstype went away.
Pws_type_list went away.
Pedge_attrs has a new field, type_asf.
Pdisp_space_size and Pdisp_space_size3 have new data types.
Pcolr_facs loses two fields and has a new one, prim_colrs.
New type: Pcieluv.
Pelem_data.anno_text3.offset type is now a Pvec3.
Pelem_data.anno_text.offset type is now a Pvec.
Pelem_data.cell_array3.dim type is now Pint_size.
Pelem_data.cell_array.dim type is now Pint_size.
Pelem_data.ext_cell_array.dim type is now Pint_size.
Ppat_ret.dim type is now Pint_size
Pdims is now Pint_size
The field Pescape_in_data.escape_in_u2.store has been removed.

PHIGS PLUS Changes for consistency with DIS
-------------------------------------------
General
-------
shading --> shad_meth
shades --> shads
shadmeths --> shad_meths
method --> meth
properties --> props
area_props --> refl_props
reflectance --> refl
equation --> eqn
approximation --> approx
criteria --> crit
surface --> surf
triangle --> tri
quadrilateral --> quad
B-spline --> bsp
uniform --> uni
non-uniform --> nuni
extended --> plus
characteristics --> characs
distinguishing --> disting
culling --> cull
depth_cue --> dcue
vertexdata --> vertex_data
edgedata --> edge_data
facetdata --> facet_data
refplanes --> ref_planes
cullmode --> cull_mode
distgmode --> disting_mode
shadmeths --> shad_meths
refeqs --> refl_eqns
uvalue --> u_val
vvalue --> v_val
ratsel --> rationality
ext_cell_array --> cell_array_plus
normal --> norm
index --> ind

The seventh parameter, "range", of NON-UNIFORM B-SPLINE SURFACE was removed.

Paspect:
--------
PPOLYLINE_SHADING_METHOD --> PASPECT_LINE_SHAD_METH
PINTERIOR_SHADING_METHOD --> PASPECT_INT_SHAD_METH
PAREA_PROPERTIES --> PASPECT_REFL_PROPS
PINTERIOR_REFLECTANCE_EQUATION --> PASPECT_INT_REFL_EQN
PBACK_INTERIOR_STYLE --> PASPECT_BACK_INT_STYLE
PBACK_INTERIOR_STYLE_INDEX --> PASPECT_BACK_INT_STYLE_IND
PBACK_INTERIOR_COLOUR --> PASPECT_BACK_INT_COLR
PBACK_INTERIOR_SHADING_METHOD --> PASPECT_BACK_INT_SHAD_METH
PBACK_AREA_PROPERTIES --> PASPECT_BACK_REFL_PROPS
PBACK_INTERIOR_REFLECTANCE_EQUATION --> PASPECT_BACK_INT_REFL_EQN
PCURVE_APPROXIMATION_CRITERIA --> PASPECT_CURVE_APPROX_CRIT
PSURFACE_APPROXIMATION_CRITERIA --> PASPECT_SURFACE_APPROX_CRIT

Pelem_type
----------
PEL_POLYLINE_SET3_DATA --> PELEM_POLYLINE_SET3_DATA
PEL_FILL_AREA_SET3_DATA --> PELEM_FILL_AREA_SET3_DATA
PEL_TRIANGLE_STRIP3_DATA --> PELEM_TRI_STRIP3_DATA
PEL_QUADRILATERAL_MESH3_DATA --> PELEM_QUAD_MESH3_DATA
PEL_SET_OF_FILL_AREA_SET3_DATA --> PELEM_SET_OF_FILL_AREA_SET3_DATA
PEL_NON_UNIFORM_B_SPLINE_CURVE --> PELEM_NUNI_BSP_CURVE
PEL_NON_UNIFORM_B_SPLINE_SURFACE --> PELEM_NUNI_BSP_SURF
PEL_EXTENDED_CELL_ARRAY3 --> PELEM_CELL_ARRAY3_PLUS
PEL_TEXT_COLR --> PELEM_TEXT_COLR
PEL_MARKER_COLR --> PELEM_MARKER_COLR
PEL_EDGE_COLR --> PELEM_EDGE_COLR
PEL_LINE_COLR --> PELEM_LINE_COLR
PEL_CURVE_APPROX_CRITERIA --> PELEM_CURVE_APPROX_CRIT
PEL_LINE_SHADING_METHOD --> PELEM_LINE_SHAD_METH
PEL_INT_COLR --> PELEM_INT_COLR
PEL_BACK_INT_COLR --> PELEM_BACK_INT_COLR
PEL_BACK_INT_STYLE --> PELEM_BACK_INT_STYLE
PEL_BACK_INT_STYLE_IND --> PELEM_BACK_INT_STYLE_IND
PEL_AREA_PROPERTIES --> PELEM_REFL_PROPS
PEL_BACK_AREA_PROPERTIES --> PELEM_BACK_REFL_PROPS
PEL_INT_SHADING_METHOD --> PELEM_INT_SHAD_METH
PEL_BACK_INT_SHADING_METHOD --> PELEM_BACK_INT_SHAD_METH
PEL_INT_REFLECTANCE_EQUATION --> PELEM_INT_REFL_EQN
PEL_BACK_INT_REFLECTANCE_EQUATION --> PELEM_BACK_INT_REFL_EQN
PEL_SURFACE_APPROX_CRITERIA --> PELEM_SURFACE_APPROX_CRIT
PEL_PARA_SURF_CHARACTERISTICS --> PELEM_PARA_SURF_CHARACS
PEL_FACE_DISTINGUISHING_MODE --> PELEM_FACE_DISTING_MODE
PEL_FACE_CULLING_MODE --> PELEM_FACE_CULL_MODE
PEL_LIGHT_SOURCE_STATE --> PELEM_LIGHT_SRC_STATE
PEL_DEPTH_CUE_IND --> PELEM_DEPTH_CUE_IND
PEL_COLR_MAP_IND --> PELEM_COLR_MAP_IND
PEL_RENDERING_COLR_MODEL --> PELEM_RENDERING_COLR_MODEL
PEL_NUM_EL_TYPES --> PELEM_NUM_EL_TYPES

Pdistg_mode
-----------
PDISTG_NO --> PDISTING_NO
PDISTG_YES --> PDISTING_YES

Pext_ws_tables
--------------
max_dcue --> dcue_rep
max_light_src --> light_src_rep
max_colr_map --> colr_map_rep

Pmod_ws_plus --> Pdyns_ws_attrs_plus
Ppara_surf_charac --> Ppara_surf_characs
Pdistg_mode --> Pdisting_mode
Pvisibility --> Pedge_flag
Pext_line_bundle --> Pline_bundle_plus
Pext_marker_bundle --> Pmarker_bundle_plus
Pext_int_bundle --> Pint_bundle_plus
Pext_edge_bundle --> Pedge_bundle_plus
Pext_pat_bundle --> Ppat_rep_plus
Pext_line_facs --> Pline_facs_plus
Pext_int_facs --> Pint_facs_plus
Pext_ws_tables --> Pws_tables_plus
Parea_props --> Prefl_props

PHIGS PLUS function names
-------------------------
pext_cell_array3 --> pcell_array3_plus
ptri3_data --> ptri_strip3_data
pquad3_data --> pquad_mesh3_data
pset_area_prop(properties --> pset_refl_props
pset_int_reflect_eq --> pset_refl_eqn
pset_back_area_prop --> pset_back_refl_props
pset_back_int_reflect_eq --> pset_back_refl_eqn
pset_ext_line_rep --> pset_line_rep_plus
pset_ext_marker_rep --> pset_marker_rep_plus
pset_ext_text_rep --> pset_text_rep_plus
pset_ext_int_rep --> pset_int_rep_plus
pset_ext_edge_rep --> pset_edge_rep_plus
pset_ext_pat_rep --> pset_pat_rep_plus
pinq_ext_line_rep --> pinq_line_rep_plus
pinq_ext_marker_rep --> pinq_marker_rep_plus
pinq_ext_text_rep --> pinq_text_rep_plus
pinq_ext_int_rep --> pinq_int_rep_plus
pinq_ext_edge_rep --> pinq_edge_rep_plus
pinq_ext_pat_rep --> pinq_pat_rep_plus
pinq_ext_line_facs --> pinq_line_facs_plus
pinq_pred_ext_line_rep --> pinq_pred_line_rep_plus
pinq_pred_ext_marker_rep --> pinq_pred_marker_rep_plus
pinq_pred_ext_text_rep --> pinq_pred_text_rep_plus
pinq_ext_int_facs --> pinq_int_facs_plus
pinq_pred_ext_int_rep --> pinq_pred_int_rep_plus
pinq_pred_ext_edge_rep --> pinq_pred_edge_rep_plus
pinq_pred_ext_pat_rep --> pinq_pred_pat_rep_plus
pinq_ext_ws_st_table --> pinq_ws_st_table_plus
pset_line_shade_method --> pset_line_shad_meth
pset_int_shade_method --> pset_int_shad_meth
pset_back_int_shade_method --> pset_back_int_shad_meth
pset_face_distg_mode --> pset_face_disting_mode
pset_para_surf_charac --> pset_para_surf_characs