I've tryed searching for an answer, but not exactly my problem came up...anyways...installing nessus at nessus-core make part and it errors out with this:

cd nessus && make
make[1]: Entering directory `/usr/src/nessus/nessus-core/nessus'
gcc -g -O2 `sh ./cflags` -c auth.c
gcc -g -O2 `sh ./cflags` -c comm.c
gcc -g -O2 `sh ./cflags` -c sighand.c
gcc -g -O2 `sh ./cflags` -c xstuff.c
In file included from xstuff.c:32:
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:31:22: /gdk/gdk.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:32:32: /gtk/gtkaccelgroup.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:33:32: /gtk/gtkaccellabel.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:34:32: /gtk/gtkadjustment.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:35:31: /gtk/gtkalignment.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:36:25: /gtk/gtkarg.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:37:33: /gtk/gtkaspectframe.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:38:27: /gtk/gtkarrow.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:39:25: /gtk/gtkbin.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:40:30: /gtk/gtkbindings.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:41:25: /gtk/gtkbox.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:42:26: /gtk/gtkbbox.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:43:28: /gtk/gtkbutton.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:44:30: /gtk/gtkcalendar.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:45:33: /gtk/gtkcheckbutton.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:46:35: /gtk/gtkcheckmenuitem.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:47:27: /gtk/gtkclist.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:48:30: /gtk/gtkcolorsel.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:49:27: /gtk/gtkcombo.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:50:28: /gtk/gtkcompat.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:51:31: /gtk/gtkcontainer.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:52:27: /gtk/gtkctree.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:53:27: /gtk/gtkcurve.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:54:26: /gtk/gtkdata.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:55:28: /gtk/gtkdialog.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:56:25: /gtk/gtkdnd.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:57:33: /gtk/gtkdrawingarea.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:58:30: /gtk/gtkeditable.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:59:27: /gtk/gtkentry.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:60:27: /gtk/gtkenums.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:61:30: /gtk/gtkeventbox.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:62:30: /gtk/gtkfeatures.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:63:29: /gtk/gtkfilesel.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:64:27: /gtk/gtkfixed.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:65:29: /gtk/gtkfontsel.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:66:27: /gtk/gtkframe.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:67:27: /gtk/gtkgamma.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:68:24: /gtk/gtkgc.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:69:31: /gtk/gtkhandlebox.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:70:26: /gtk/gtkhbox.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:71:27: /gtk/gtkhbbox.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:72:28: /gtk/gtkhpaned.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:73:28: /gtk/gtkhruler.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:74:28: /gtk/gtkhscale.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:75:32: /gtk/gtkhscrollbar.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:76:32: /gtk/gtkhseparator.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:77:27: /gtk/gtkimage.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:78:33: /gtk/gtkinputdialog.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:79:26: /gtk/gtkitem.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:80:33: /gtk/gtkitemfactory.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:81:27: /gtk/gtklabel.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:82:28: /gtk/gtklayout.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:83:26: /gtk/gtklist.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:84:30: /gtk/gtklistitem.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:85:26: /gtk/gtkmain.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:86:26: /gtk/gtkmenu.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:87:29: /gtk/gtkmenubar.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:88:33: /gtk/gtkmenufactory.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:89:30: /gtk/gtkmenuitem.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:90:31: /gtk/gtkmenushell.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:91:26: /gtk/gtkmisc.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:92:30: /gtk/gtknotebook.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:93:28: /gtk/gtkobject.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:94:32: /gtk/gtkoptionmenu.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:95:28: /gtk/gtkpacker.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:96:27: /gtk/gtkpaned.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:97:28: /gtk/gtkpixmap.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:98:26: /gtk/gtkplug.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:99:29: /gtk/gtkpreview.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:100:30: /gtk/gtkprogress.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:101:33: /gtk/gtkprogressbar.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:102:33: /gtk/gtkradiobutton.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:103:35: /gtk/gtkradiomenuitem.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:104:27: /gtk/gtkrange.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:105:24: /gtk/gtkrc.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:106:27: /gtk/gtkruler.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:107:27: /gtk/gtkscale.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:108:31: /gtk/gtkscrollbar.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:109:36: /gtk/gtkscrolledwindow.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:110:31: /gtk/gtkselection.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:111:31: /gtk/gtkseparator.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:112:28: /gtk/gtksignal.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:113:28: /gtk/gtksocket.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:114:32: /gtk/gtkspinbutton.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:115:27: /gtk/gtkstyle.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:116:31: /gtk/gtkstatusbar.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:117:27: /gtk/gtktable.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:118:37: /gtk/gtktearoffmenuitem.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:119:26: /gtk/gtktext.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:120:28: /gtk/gtkthemes.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:121:31: /gtk/gtktipsquery.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:122:34: /gtk/gtktogglebutton.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:123:29: /gtk/gtktoolbar.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:124:30: /gtk/gtktooltips.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:125:26: /gtk/gtktree.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:126:30: /gtk/gtktreeitem.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:127:31: /gtk/gtktypeutils.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:128:26: /gtk/gtkvbox.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:129:27: /gtk/gtkvbbox.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:130:30: /gtk/gtkviewport.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:131:28: /gtk/gtkvpaned.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:132:28: /gtk/gtkvruler.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:133:28: /gtk/gtkvscale.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:134:32: /gtk/gtkvscrollbar.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:135:32: /gtk/gtkvseparator.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:136:28: /gtk/gtkwidget.h: No such file or directory
/usr/src/nessus/gtk+-1.2.10/gtk/gtk.h:137:28: /gtk/gtkwindow.h: No such file or directory
In file included from xstuff.c:35:
xstuff.h:24: parse error before '*' token
xstuff.h:25: parse error before '*' token
xstuff.h:26: parse error before '*' token
xstuff.h:26: parse error before '*' token
xstuff.h:26: warning: type defaults to `int' in declaration of `make_pixmap'
xstuff.h:26: warning: data definition has no type or storage class
xstuff.c: In function `init_display':
xstuff.c:41: warning: implicit declaration of function `gtk_init'
xstuff.c: At top level:
xstuff.c:45: parse error before '*' token
xstuff.c: In function `close_window':
xstuff.c:47: warning: implicit declaration of function `gtk_widget_hide'
xstuff.c:47: `w' undeclared (first use in this function)
xstuff.c:47: (Each undeclared identifier is reported only once
xstuff.c:47: for each function it appears in.)
xstuff.c:49: `FALSE' undeclared (first use in this function)
xstuff.c: At top level:
xstuff.c:51: parse error before '*' token
xstuff.c: In function `delete_event':
xstuff.c:53: `FALSE' undeclared (first use in this function)
xstuff.c: In function `close_display':
xstuff.c:57: warning: implicit declaration of function `gtk_main_quit'
xstuff.c: At top level:
xstuff.c:63: parse error before "GdkPixmap"
xstuff.c:63: warning: no semicolon at end of struct or union
xstuff.c:64: warning: type defaults to `int' in declaration of `mask'
xstuff.c:64: warning: data definition has no type or storage class
xstuff.c:65: parse error before '}' token
xstuff.c:68: parse error before "p"
xstuff.c: In function `pixmap_and_mask_destroy_notify':
xstuff.c:70: warning: implicit declaration of function `gdk_pixmap_unref'
xstuff.c:70: `p' undeclared (first use in this function)
xstuff.c:71: warning: implicit declaration of function `gdk_bitmap_unref'
xstuff.c:72: warning: implicit declaration of function `g_free'
xstuff.c: At top level:
xstuff.c:75: parse error before '*' token
xstuff.c:77: parse error before '*' token
xstuff.c:80: warning: return type defaults to `int'
xstuff.c: In function `make_pixmap':
xstuff.c:82: `gchar' undeclared (first use in this function)
xstuff.c:82: parse error before "name"
xstuff.c:83: `GdkColormap' undeclared (first use in this function)
xstuff.c:83: `colormap' undeclared (first use in this function)
xstuff.c:85: warning: implicit declaration of function `g_snprintf'
xstuff.c:85: `name' undeclared (first use in this function)
xstuff.c:85: `xpm_data' undeclared (first use in this function)
xstuff.c:86: warning: implicit declaration of function `gtk_object_get_data'
xstuff.c:86: warning: implicit declaration of function `GTK_OBJECT'
xstuff.c:86: `widget' undeclared (first use in this function)
xstuff.c:86: warning: assignment makes pointer from integer without a cast
xstuff.c:88: warning: implicit declaration of function `g_malloc'
xstuff.c:88: dereferencing pointer to incomplete type
xstuff.c:88: warning: assignment makes pointer from integer without a cast
xstuff.c:89: warning: implicit declaration of function `gtk_widget_get_colormap'
xstuff.c:90: dereferencing pointer to incomplete type
xstuff.c:91: warning: implicit declaration of function `gdk_pixmap_colormap_create_from_xpm_d'
xstuff.c:92: dereferencing pointer to incomplete type
xstuff.c:92: `transparent' undeclared (first use in this function)
xstuff.c:92: parse error before ')' token
xstuff.c:94: warning: implicit declaration of function `gtk_object_set_data_full'
xstuff.c:96: warning: implicit declaration of function `gtk_pixmap_new'
xstuff.c:96: dereferencing pointer to incomplete type
xstuff.c:96: dereferencing pointer to incomplete type
xstuff.c:96: warning: return makes pointer from integer without a cast
make[1]: *** [xstuff.o] Error 1
make[1]: Leaving directory `/usr/src/nessus/nessus-core/nessus'
make: *** [client] Error 2

RH8.0
nessus 2.09