[Plib-users] Compiling problems in SGI Irix 6.5.7

[Wein G. <cr...@us...>]

Hi, friends,

I am trying my first compilation of Plib for FlightGear, and use SGI
Octane machine's 7.3 C++ compiler in IRIX 6.5.7.

I have installed all the needed libraries without any problems and
configure is happy. But now when I tried to "make", it stops on an 
error:

--------------------------Error 1-------------------------- 
 CC -DPACKAGE=\"plib\" -DVERSION=\"1.1.11\" -DHAVE_LIBGLCORE=1
 -DHAVE_LIBGL=1 -DHAVE_LIBGLU=1 -DHAVE_LIBGLUT
=1 -DHAVE_LIBAUDIO=1 -DSTDC_HEADERS=1 -DHAVE_GL_GL_H=1 -DHAVE_GL_GLU_H=1
  -DGLUT_IS_PRESENT=1  -I. -I.      -g -I/usr/local/include
  -L/usr/local/lib -c sgIsect.cxx
cc-1020 CC: ERROR File = sgIsect.cxx, Line = 29
  The identifier "FLT_EPSILON" is undefined.

    if ( dnorm < FLT_EPSILON )
                 ^

cc-1020 CC: ERROR File = sgIsect.cxx, Line = 89
  The identifier "FLT_EPSILON" is undefined.

    if ( sgAbs ( tmp ) < FLT_EPSILON )
                         ^

cc-1020 CC: ERROR File = sgIsect.cxx, Line = 127
  The identifier "FLT_EPSILON" is undefined.

    if ( dist < FLT_EPSILON )
                ^
3 errors detected in the compilation of "sgIsect.cxx".
*** Error code 2 (bu21)
*** Error code 1 (bu21)
*** Error code 1 (bu21)
-------------------Error 1 end-----------------------



 
I define the FLT_EPSILON to a value randomly, say, 1.0, 
it continues "make" and stops at another big error:

-------------------Error 2 begin-----------------
              

cc-1133 CC: ERROR File = ssgSimpleState.cxx, Line = 18
  Expression must be a modifiable lvalue.

    specular_colour = src -> specular_colour ;
    ^

cc-1133 CC: ERROR File = ssgSimpleState.cxx, Line = 19
  Expression must be a modifiable lvalue.

    emission_colour = src -> emission_colour ;
    ^

cc-1133 CC: ERROR File = ssgSimpleState.cxx, Line = 20
  Expression must be a modifiable lvalue.

     ambient_colour = src ->  ambient_colour ;
     ^

cc-1133 CC: ERROR File = ssgSimpleState.cxx, Line = 21
  Expression must be a modifiable lvalue.

     diffuse_colour = src ->  diffuse_colour ;
     ^

4 errors detected in the compilation of "ssgSimpleState.cxx".
*** Error code 2 (bu21)
*** Error code 1 (bu21)
*** Error code 1 (bu21)
 
------------------------------------


How to solve these problems? Would you please kindly enough
to help me to finish "make" in SGI environment?

Many thanks.

-Wein

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