[PATCH -perfbook 3/8] Makefile: Allow rsvg-convert 2.52

rsvg-convert 2.52.5 (on Ubuntu 22.04 LTS) output PDF 1.5 by default
and is good enough for perfbook.
Add rules for using it in SVG --> PDF conversion.

rsvg-convert versions >= 2.54 and < 2.57 default to PDF 1.7 and don't
have option of --format pdf1.5.  Avoid using those interim versions
by default.

Signed-off-by: Akira Yokosawa <[email protected]>
---
 Makefile | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 9f19ce52..3844c37b 100644
--- a/Makefile
+++ b/Makefile
@@ -119,12 +119,24 @@ ifdef RSVG_CONVERT
   RSVG_CONVERT_VER := $(shell rsvg-convert --version | $(SED) -e 's/rsvg-convert version //')
   RSVG_CONVERT_VER_MINOR := $(shell echo $(RSVG_CONVERT_VER) | $(SED) -E -e 's/^([0-9]+\.[0-9]+).*/\1/')
   RSVG_CONVERT_GOOD_VER ?= 2.57
+  RSVG_CONVERT_PDFFMT_VER := 2.57
+  RSVG_CONVERT_ACCEPTABLE_VER := 2.52
   RSVG_CONVERT_GOOD := $(shell echo $(RSVG_CONVERT_VER_MINOR) $(RSVG_CONVERT_GOOD_VER) | awk '{if ($$1 >= $$2) print 1;}')
+  RSVG_CONVERT_ACCEPTABLE := $(shell echo $(RSVG_CONVERT_VER_MINOR) $(RSVG_CONVERT_ACCEPTABLE_VER) | awk '{if ($$1 == $$2) print 1;}')
+  ifeq ($(RSVG_CONVERT_ACCEPTABLE),1)
+    RSVG_CONVERT_GOOD := 1
+  endif
+  RSVG_CONVERT_PDFFMT := $(shell echo $(RSVG_CONVERT_VER_MINOR) $(RSVG_CONVERT_PDFFMT_VER) | awk '{if ($$1 >= $$2) print 1;}')
   ifeq ($(RSVG_CONVERT_GOOD),1)
     SVG_PDF_CONVERTER = (rsvg-convert v$(RSVG_CONVERT_VER))
   else
     SVG_PDF_CONVERTER = (inkscape)
   endif
+  ifeq ($(RSVG_CONVERT_PDFFMT),1)
+    RSVG_FMT_OPT := --format=pdf1.5
+  else
+    RSVG_FMT_OPT := --format=pdf
+  endif
 else
   SVG_PDF_CONVERTER = (inkscape)
 endif
@@ -503,7 +515,7 @@ ifeq ($(RECOMMEND_LIBERATIONMONO),1)
 endif
 
 ifeq ($(RSVG_CONVERT_GOOD),1)
-	@cat $<i | rsvg-convert --format=pdf1.5 > $@
+	@cat $<i | rsvg-convert $(RSVG_FMT_OPT) > $@
 else
   ifeq ($(INKSCAPE_ONE),0)
 	@inkscape --export-pdf=$@ $<i > /dev/null 2>&1
-- 
2.34.1