Lower Pango required version from 1.22 to 1.16

src/drivers/Cairo/Fl_Cairo_Graphics_Driver.cxx

@@ -27,6 +27,9 @@
 #include <FL/fl_draw.H>
 #include <cairo/cairo.h>
 #include <pango/pangocairo.h>
+#if ! PANGO_VERSION_CHECK(1,16,0)
+#  error "Requires Pango 1.16 or higher"
+#endif
 #include <math.h>
 #include <stdlib.h>  // abs(int)
 #include <string.h>  // memcpy()
@@ -1134,7 +1137,11 @@ Fl_Cairo_Font_Descriptor::Fl_Cairo_Font_Descriptor(const char* name, Fl_Fontsize
   delete[] string;
   width = NULL;
   //A PangoFontset represents a set of PangoFont to use when rendering text.
-  PangoFontset *fontset = pango_font_map_load_fontset(pango_cairo_font_map_get_default(), context, fontref, pango_language_get_default());
+  PangoFontset *fontset = pango_font_map_load_fontset(
+                                      pango_cairo_font_map_get_default(), // 1.10
+                                      context, fontref,
+                                      pango_language_get_default() // 1.16
+                                                      );
   PangoFontMetrics *metrics = pango_fontset_get_metrics(fontset);
   ascent = pango_font_metrics_get_ascent(metrics);
   descent = pango_font_metrics_get_descent(metrics);
@@ -1201,7 +1208,12 @@ void Fl_Cairo_Graphics_Driver::font(Fl_Font fnum, Fl_Fontsize s) {
     //A PangoFontMap represents the set of fonts available for a particular rendering system.
     PangoFontMap *def_font_map = pango_cairo_font_map_get_default(); // 1.10
     //A PangoContext stores global information used to control the itemization process.
+#if PANGO_VERSION_CHECK(1,22,0)
     pango_context_ = pango_font_map_create_context(def_font_map); // 1.22
+#else
+    pango_context_ = pango_context_new();
+    pango_context_set_font_map(pango_context_, def_font_map);
+#endif
     pango_layout_ = pango_layout_new(pango_context_);
   }
   font_descriptor( find(fnum, s, pango_context_) );

src/drivers/PostScript/Fl_PostScript.cxx

@@ -32,8 +32,8 @@
 #include <FL/math.h> // for M_PI
 #include <pango/pangocairo.h>
 #include <cairo/cairo-ps.h>
-#  if ! PANGO_VERSION_CHECK(1,22,0)
-#    error "Requires Pango 1.22 or higher"
+#  if ! PANGO_VERSION_CHECK(1,10,0)
+#    error "Requires Pango 1.10 or higher"
 #  endif
 #endif
 
@@ -1527,7 +1527,12 @@ void Fl_PostScript_Graphics_Driver::transformed_draw(const char* str, int n, dou
   if (!n) return;
   if (!pango_context_) {
     PangoFontMap *def_font_map = pango_cairo_font_map_get_default(); // 1.10
+#if PANGO_VERSION_CHECK(1,22,0)
     pango_context_ = pango_font_map_create_context(def_font_map); // 1.22
+#else
+    pango_context_ = pango_context_new();
+    pango_context_set_font_map(pango_context_, def_font_map);
+#endif
     pango_layout_ = pango_layout_new(pango_context_);
   }
   PangoFontDescription *pfd = Fl_Graphics_Driver::default_driver().pango_font_description();

src/drivers/Wayland/Fl_Wayland_Graphics_Driver.cxx

@@ -17,10 +17,6 @@
 #include "Fl_Wayland_Graphics_Driver.H"
 #include "Fl_Wayland_Screen_Driver.H"
 #include "Fl_Wayland_Window_Driver.H"
-#include <pango/pangocairo.h>
-#if ! PANGO_VERSION_CHECK(1,22,0)
-#  error "Requires Pango 1.22 or higher"
-#endif
 #include <sys/mman.h>
 #include <unistd.h> // for close()
 #include <errno.h>