I'm also seeing this - same version, Solaris 8, gcc 4.0.3.

Only on version 1.6: trunk doesn't use trunc(). Who'da thunk? :-)

SVN commit 615038 by ingwa:

Fix bug 138148: Compile error on Solaris 8 -
kchart/kdchart/KDChartAxesPainter.cpp uses trunc, which is not
available
	
 * kdchart/KDChartAxesPainter.cpp: trunc(): Define it.

 We could make a complicated workaround using #if's and stuff, but
this is the simplest solution, i.e. to simply define our own trunc().

BUG: 138148



 M  +10 -0     ChangeLog  
 M  +16 -0     kdchart/KDChartAxesPainter.cpp  


--- branches/koffice/1.6/koffice/kchart/ChangeLog #615037:615038
@@ -1,3 +1,13 @@
+2006-12-19  Inge Wallin  <inge@lysator.liu.se>
+
+	Fix bug 138148: Compile error on Solaris 8 -
+	kchart/kdchart/KDChartAxesPainter.cpp uses trunc, which is not
+	available
+	
+	* kdchart/KDChartAxesPainter.cpp: trunc(): Define it, since some
+	OSes, like Solaris, doesn't have it.  We could make a complicated
+	workaround, but this is the simplest solution.  
+	
 2006-11-07  Inge Wallin  <inge@lysator.liu.se>
 
 	Start on bug 134194: Impossible to change the data range.
--- branches/koffice/1.6/koffice/kchart/kdchart/KDChartAxesPainter.cpp #615037:615038
@@ -3701,10 +3701,26 @@
     return sVal;
 }
 
+#if 0
+
 #if defined ( Q_WS_WIN)
 #define trunc(x) ((int)(x))
 #endif
 
+#else
+
+// Ugly hack because Solaris (among others?) doesn't have trunc(),
+// since the libs are not C99.  I could do a complex #if expression,
+// but instead I will just define trunc() here.
+
+double trunc(double x)
+{
+    return x >= 0.0 ? floor(x) : -floor(-x);
+}
+
+#endif
+
+
 QString KDChartAxesPainter::applyLabelsFormat( const double nVal_,
                         int   divPow10,
                         int   behindComma,